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Adolescence is a critical period for brain development, consolidation of self-understanding, and onset of non-suicidal self-injury (NSSI). This study evaluated the RDoC (Research Domain Criteria) sub-construct of Self-Knowledge in relation to adolescent NSSI using multiple units of analysis.
Methods
One hundred and sixty-four adolescents assigned female at birth (AFAB), ages 12–16 years with and without a history of NSSI entered a study involving clinical assessment and magnetic resonance imaging (MRI), including structural, resting-state functional MRI (fMRI), and fMRI during a self-evaluation task. For imaging analyses, we used an a priori defined Self Network (anterior cingulate, orbitofrontal, and posterior cingulate cortices; precuneus). We first examined interrelationships among multi-level Self variables. We then evaluated the individual relationships between NSSI severity and multi-level Self variables (self-report, behavior, multi-modal brain Self Network measures), then conducted model testing and multiple regression to test how Self variables (together) predicted NSSI severity.
Results
Cross-correlations revealed key links between self-reported global self-worth and self-evaluation task behavior. Individually, greater NSSI severity correlated with lower global self-worth, more frequent and faster negative self-evaluations, lower anterior Self Network activation during self-evaluation, and lower anterior and posterior Self Network resting-state connectivity. Multiple regression analysis revealed the model including multi-level Self variables explained NSSI better than a covariate-only model; the strongest predictive variables included self-worth, self-evaluation task behavior, and resting-state connectivity.
Conclusions
Disruptions in Self-Knowledge across multiple levels of analysis relate to NSSI in adolescents. Findings suggest potential neurobiological treatment targets, potentially enhancing neuroplasticity in Self systems to facilitate greater flexibility (more frequently positive) of self-views in AFAB adolescents.
Currently, there are limited data comparing demographic and clinical characteristics of individuals who died by probable suicide and who did and did not previously attend mental health services (MHSs). This study compared demographic and clinical factors for both groups, in a Western region of Ireland over a 13-year period. Postmortem reports between January 1, 2006 and March 31, 2019 were reviewed for 400 individuals who died by probable suicide. Relevant sociodemographic and clinical data were extracted from individuals’ lifetime case notes. One hundred and fifty nine individuals (40%) had attended MHSs at some stage (“attendee”). Hanging was the most common method of suicide (61%), followed by drowning (18%) for both attendees and nonattendees of MHSs, with more violent methods utilized overall by nonattendees (p = 0.028). Sixty-eight percent of individuals who previously attempted hanging subsequently died utilizing this method. A higher proportion of attendees were female compared to nonattendees of MHSs (28.9 vs. 14.5%, p = 0.001). Recurrent depressive disorder (55%) was the most common diagnosed mental health disorder. For individuals with a diagnosis of schizophrenia, 39% had antipsychotic medications detectable in their toxicology reports. In conclusion, the majority of people who died by probable suicide had never had contact with MHSs, and nonattendees overall were more likely to utilize violent methods of suicide. Nonconcordance with psychotropic medications in psychotic patients and previous hanging attempt were highlighted as potential risk factors for death by probable suicide.
Nonsuicidal self-injury (NSSI) is a common but poorly understood phenomenon in adolescents. This study examined the Sustained Threat domain in female adolescents with a continuum of NSSI severity (N = 142). Across NSSI lifetime frequency and NSSI severity groups (No + Mild NSSI, Moderate NSSI, Severe NSSI), we examined physiological, self-reported and observed stress during the Trier Social Stress Test; amygdala volume; amygdala responses to threat stimuli; and resting-state functional connectivity (RSFC) between amygdala and medial prefrontal cortex (mPFC). Severe NSSI showed a blunted pattern of cortisol response, despite elevated reported and observed stress during TSST. Severe NSSI showed lower amygdala–mPFC RSFC; follow-up analyses suggested that this was more pronounced in those with a history of suicide attempt for both moderate and severe NSSI. Moderate NSSI showed elevated right amygdala activation to threat; multiple regressions showed that, when considered together with low amygdala–mPFC RSFC, higher right but lower left amygdala activation predicted NSSI severity. Patterns of interrelationships among Sustained Threat measures varied substantially across NSSI severity groups, and further by suicide attempt history. Study limitations include the cross-sectional design, missing data, and sampling biases. Our findings highlight the value of multilevel approaches in understanding the complexity of neurobiological mechanisms in adolescent NSSI.
People with severe mental illness and intellectual disabilities are overrepresented in the criminal justice system worldwide and this is also the case in Ireland. Following Ireland’s ratification of the United Nations’ Convention on the Rights of People with Disabilities in 2018, there has been an increasing emphasis on ensuring access to justice for people with disabilities as in Article 13. For people with mental health and intellectual disabilities, this requires a multi-agency approach and a useful point of intervention may be at the police custody stage. Medicine has a key role to play both in advocacy and in practice. We suggest a functional approach to assessment, in practice, and list key considerations for doctors attending police custody suites. Improved training opportunities and greater resources are needed for general practitioners and psychiatrists who attend police custody suites to help fulfill this role.
Traumatic brain injuries (TBI) may lead to persistent depression symptoms. We conducted several pilot studies to examine the efficacy of mindfulness-based interventions to deal with this issue; all showed strong effect sizes. The logical next step was to conduct a randomized controlled trial (RCT).
Objective
We sought to determine the efficacy of mindfulness-based cognitive therapy for people with depression symptoms post-TBI (MBCT-TBI).
Methods
Using a multi-site RCT design, participants (mean age = 47) were randomized to intervention or control arms. Treatment participants received a group-based, 10-week intervention; control participants waited. Outcome measures, administered pre- and post-intervention, and after three months, included: Beck Depression Inventory-II (BDI-II), Patient Health Questionnaire-9 (PHQ-9), and Symptom Checklist-90-Revised (SCL-90-R). The Philadelphia Mindfulness Scale (PHLMS) captured present moment awareness and acceptance.
Results
BDI-II scores decreased from 25.47 to 18.84 in treatment groups while they stayed relatively stable in control groups (respectively 27.13 to 25.00; p = .029). We did not find statistically significant differences on the PHQ-9 and SCL-90R post- treatment. However, after three months, all scores were statistically significantly lower than at baseline (ps < .01). Increases in mindfulness were associated with decreases in BDI-II scores (r[29] = -.401, p = .025).
Conclusions
MBCT-TBI may alleviate depression symptoms up to three months post-intervention. Greater mindfulness may have contributed to the reduction in depression symptoms although the association does not confirm causality. More work is required to replicate these findings, identify subgroups that may better respond to the intervention, and refine the intervention to maximize its effectiveness.
Introduction: Patient-reported outcome measures (PROM) are questionnaires that can be used to elicit care outcome information from patients. We sought to develop and validate the first PROM for adult patients without a primary mental health or addictions presentation receiving emergency department (ED) care and who were not hospitalized. Methods: PROM development used a multi-phase process based on national and international guidance (FDA, NQF, ISPOR). Phase 1: ED outcome conceptual framework qualitative interviews with ED patients post-discharge informed four core domains (previously published). Phase 2: Item generation scoping review of the literature and existing instruments identified candidate questions relevant for each domain for inclusion in tool. Phase 3: Cognitive debriefing existing and newly written questions were tested with ED patients post-discharge for comprehension and wording preference. Phase 4: Field and validity testing revised tool pilot tested on a national online survey panel and then again at 2 weeks (test-retest). Phase 5: Final item reduction using a Delphi process involving ED clinicians, researchers, patients and system administrators. Phase 6: Validation - psychometric testing of PROM-ED 1.0. Results: Four core outcome domains were defined in Phase 1: (1) understanding; (2) symptom relief; (3) reassurance and (4) having a plan. The domains informed a review of existing relevant questionnaires and instruments and the writing of additional questions creating an initial long-form questionnaire. Eight patients participated in cognitive debriefing of the long-form questionnaire. Expert clinicians, researchers and patient partners provided input on item refinement and reduction. Four hundred forty-four patients completed a second version of the long-form questionnaire (add in retest numbers) which informed the final item reduction process by a modified Delphi method involving 21 diverse contributors. The questionnaire was validated and underwent final revisions to create the 21 questions that constitute PROM-ED 1.0. Conclusion: Using accepted PROM instrument development methodology, we developed the first outcome questionnaire for use with adult ED patients who are not hospitalized. This questionnaire can be used to systematically gather patient-reported outcome information that could support and inform improvement work in ED care.
Alcohol consumption around the time of conception is highly prevalent in Western countries. Exposure to ethanol levels during gestation has been associated with altered development of the mesolimbic reward pathway in rats and increased propensity to addiction, however the effect of exposure only around the time of conception is unknown. The current study investigated the effects of periconceptional alcohol exposure (PC:EtOH) on alcohol and palatable food preferences and gene expression in the ventral tegmental area (VTA) and the nucleus accumbens of the adult offspring. Rats were exposed to a liquid diet containing ethanol (EtOH) (12.5% vol/vol) or a control diet from 4 days before mating until 4 days after mating. PC:EtOH had no effect on alcohol preference in either sex. At 15 months of age, however, male PC:EtOH offspring consumed more high-fat food when compared with male control offspring, but this preference was not observed in females. Expression of the dopamine receptor type 1 (Drd1a) was lower in the VTA of male PC:EtOH offspring compared with their control counterparts. There was no effect of PC:EtOH on mRNA expression of the µ-opioid receptor, tyrosine hydroxylase (Th), dopamine receptor type 2 (Drd2) or dopamine active transporter (Slc6a3). These data support the hypothesis that periconceptional alcohol exposure can alter expression of key components of the mesolimbic reward pathway and heighten the preference of offspring for palatable foods and may therefore increase their propensity towards diet-induced obesity. These results highlight the importance of alcohol avoidance when planning a pregnancy.
A warmer and potentially drier future climate is likely to influence the production of forage crops on dairy farms in the southeast dairy regions of Australia. Biophysical modelling was undertaken to explore the resilience of forage production of individual forage crops to scalar increases in temperature, atmospheric carbon dioxide (CO2) concentration and changes in daily rainfall. The model APSIM was adapted to reflect species specific responses to growth under elevated atmospheric CO2 concentrations. It was then used to simulate 40 years of production of forage wheat, oats, annual ryegrass, maize grown for silage, forage sorghum, forage rape and alfalfa grown at three locations in southeast Australia with increased temperature scenarios (1, 2, 3 and 4 °C of warming) and atmospheric CO2 concentration (435, 535, 640 and 750 ppm) and decreasing rainfall scenarios (10, 20 or 30% less rainfall). At all locations positive increases in DM yield compared with the baseline climate scenario were predicted for lucerne (2·6–93·2% increase), wheat (8·9–37·4% increase), oats (6·1–35·9% increase) and annual ryegrass (9·7–66·7% increase) under all future climate scenarios. The response of forage rape and forage sorghum varied between location and climate change scenario. At all locations, maize was predicted to have a minimal change in yield under all future climates (between a 2·6% increase and a 6·8% decrease). The future climate scenarios altered the seasonal pattern of forage supply for wheat, oats and lucerne with an increase in forage produced during winter. The resilience of forage crops to climate change indicates that they will continue to be an important component of dairy forage production in southeastern Australia.
A major cause of death in Irish men aged 15–24 is suicide and the rates for those aged 15–19 are amongst the highest in Europe. Despite concerns over suicidal ideation or behaviour, little research has been done in the Irish primary care context. We therefore aimed to carry out a study of Irish General Practitioners (GPs)’ experience regarding suicidal ideation or behaviour in children and adolescents.
Methods
The study design was a descriptive, cross-sectional, questionnaire survey. We randomly selected 480 GPs and invited them to participate via post.
Results
In total, 198 GPs replied, representing a response rate of 41% with a sampling error of ±6.8%. In total, 184 of respondents (93%) saw more than 50 children and adolescent patients annually, however, presentations of suicidal ideation and behaviour were relatively rare, with 36% reporting seeing none, 58% seeing between one and five and 6% seeing more than five such presentations annually. In total, 119 (62%) of GPs reported a willingness to prescribe antidepressants for this age group. In total, 66% of GPs felt this was either ‘always’ or ‘usually’ a difficult patient group to manage, and the single most commonly reported difficulty by GPs was access to services [n=48 (33%)].
Conclusions
GPs reported that their management of children and adolescents with suicidal ideation or behaviour is often difficult. GPs play a key liaison role in the area of child and adolescent mental health, but our results indicate that GPs are also involved in the treatment of this patient group. However, ongoing education was not a priority according to GPs themselves.
This study investigated differences in cognitive performance between middle-aged adults with and without a lifetime history of mood disorder features, adjusting for a range of potential confounders.
Methods
Cross-sectional analysis of baseline data from the UK Biobank cohort. Adults aged 40–69 (n = 143,828) were assessed using measures of reasoning, reaction time and memory. Self-reported data on lifetime features of major depression and bipolar disorder were used to construct groups for comparison against controls. Regression models examined the association between mood disorder classification and cognitive performance, adjusting for sociodemographic, lifestyle and clinical confounders.
Results
Inverse associations between lifetime history of bipolar or severe recurrent depression features and cognitive performance were attenuated or reversed after adjusting for confounders, including psychotropic medication use and current depressive symptoms. Participants with a lifetime history of single episode or moderate recurrent depression features outperformed controls to a small (but statistically significant) degree, independent of adjustment for confounders. There was a significant interaction between use of psychotropic medication and lifetime mood disorder features, with reduced cognitive performance observed in participants taking psychotropic medication.
Conclusions
In this general population sample of adults in middle age, lifetime features of recurrent depression or bipolar disorder were only associated with cognitive impairment within unadjusted analyses. These findings underscore the importance of adjusting for potential confounders when investigating mood disorder-related cognitive function.
To examine the bribing behavior of firms, we developed a cross-level moderation model using agency theory at the firm level and anomie theory at the societal level to investigate the relationship between manager control of firms and firm bribery activity. The results of this cross-cultural analysis using a sample of 1,799 firms from 38 nations showed that at the firm level, manager-controlled firms (MCFs) have a higher propensity to bribe than shareholder-controlled firms. At the country level, bribery is higher in MCFs (relative to shareholder-controlled firms) in societies with a low level of institutional collectivism, a high level of uncertainty avoidance, economic change, and income inequality. Contrary to the hypothesis, the relationship between bribery and manager control is stronger rather than weaker in societies with press freedom. Implications for future research and practices are discussed.
The ITRACK study explored the process and predictors of transition between Child and Adolescent Mental Health Services (CAMHS) and Adult Mental Health Services (AMHS) in the Republic of Ireland.
Method
Following ethical approval, clinicians in each of Ireland’s four Health Service Executive (HSE) areas were contacted, informed about the study and were invited to participate. Clinicians identified all cases who had reached the transition boundary (i.e. upper age limit for that CAMHS team) between January and December 2010. Data were collected on clinical and socio-demographic details and factors that informed the decision to refer or not refer to the AMHS, and case notes were scrutinised to ascertain the extent of information exchanged between services during transition.
Results
A total of 62 service users were identified as having crossed the transition boundary from nine CAMHS [HSE Dublin Mid-Leinster (n=40, 66%), HSE South (n=18, 30%), HSE West (n=2, 3%), HSE Dublin North (n=1, 2%)]. The most common diagnoses were attention deficit hyperactivity disorder (ADHD; n=19, 32%), mood disorders (n=16, 27%), psychosis (n=6, 10%) and eating disorders (n=5, 8%). Forty-seven (76%) of those identified were perceived by the CAMHS clinician to have an ‘on-going mental health service need’, and of these 15 (32%) were referred, 11 (23%) young people refused and 21 (45%) were not referred, with the majority (12, 57%) continuing with the CAMHS for more than a year beyond the transition boundary. Young people with psychosis were more likely to be referred [χ2 (2, 46)=8.96, p=0.02], and those with ADHD were less likely to be referred [χ2 (2, 45)=8.89, p=0.01]. Being prescribed medication was not associated with referral [χ2 (2, 45)=4.515, p=0.11]. In referred cases (n=15), there was documented evidence of consent in two cases (13.3%), inferred in another four (26.7%) and documented preparation for transition in eight (53.3%). Excellent written communication (100%) was not supported by face-to-face planning meetings (n=2, 13.3%), joint appointments (n=1, 6.7%) or telephone conversations (n=1, 6.7%) between corresponding clinicians.
Conclusions
Despite perceived on-going mental health (MH) service need, many young people are not being referred or are refusing referral to the AMHS, with those with ADHD being the most affected. CAMHS continue to offer on-going care past the transition boundary, which has resource implications. Further qualitative research is warranted to understand, in spite of perceived MH service need, the reason for non-referral by the CAMHS clinicians and refusal by the young person.
Social context has a major influence on the detection and treatment of youth mental and substance use disorders in socioeconomically disadvantaged urban areas, particularly where gang culture, community violence, normalisation of drug use and repetitive maladaptive family structures prevail. This paper aims to examine how social context influences the development, identification and treatment of youth mental and substance use disorders in socioeconomically disadvantaged urban areas from the perspectives of health care workers.
Method
Semi-structured interviews were conducted with health care workers (n=37) from clinical settings including: primary care, secondary care and community agencies and analysed thematically using Bronfenbrenner’s Ecological Theory to guide analysis.
Results
Health care workers’ engagement with young people was influenced by the multilevel ecological systems within the individual’s social context which included: the young person’s immediate environment/‘microsystem’ (e.g., family relationships), personal relationships in the ‘mesosystem’ (e.g., peer and school relationships), external factors in the young person’s local area context/‘exosystem’ (e.g., drug culture and criminality) and wider societal aspects in the ‘macrosystem’ (e.g., mental health policy, health care inequalities and stigma).
Conclusions
In socioeconomically disadvantaged urban areas, social context, specifically the micro-, meso-, exo-, and macro-system impact both on the young person’s experience of mental health or substance use problems and services, which endeavour to address these problems. Interventions that effectively identify and treat these problems should reflect the additional challenges posed by such settings.
By
Len C. Gray, The University of Queensland,
David J. Cullen, Australian National University,
Harold B. Lomas, Australian Department of Industry, Innovation, Science, Research and Tertiary Education
Edited by
Vincent Mor, Brown University, Rhode Island,Tiziana Leone, London School of Economics and Political Science,Anna Maresso, London School of Economics and Political Science
This chapter describes the arrangements in Australia for regulating the quality of long-term care services delivered in the community or in a residential setting. Its focus is on the long-term care of ‘older people’ – ‘aged care’ in Australian parlance. The chapter begins with an overview of Australia’s aged care system and its quality framework, including its place within the broader health and welfare system. It then discusses the arrangements for regulating the quality of residential care, which have been a major focus in recent decades, and the arrangements for regulating the quality of community care, which have a shorter history and are less developed. The chapter then discusses current reforms, which are aimed at better integrating these arrangements within and across programmes, and concludes with some reflections on the key challenges currently facing Australian public policy in this area.
Overview of Australia’s aged care system and its quality framework
Australia’s aged care system is funded and regulated through a complex set of arrangements, involving different levels of government and a diverse range of stakeholders, including informal carers and formal care providers from the not-for-profit (religious and charitable), for-profit and government sectors. These arrangements reflect, in part, the broader Australian health and welfare system, involving a similarly complex range of providers, with responsibilities for funding, regulation and service delivery shared between the three levels of government: federal, state and territory (‘state’), and local (AIHW, 2010, 2011a).
Because a majority of urinary tract stones (UTSs) pass spontaneously and clinically significant alternative pathology is rare, we hypothesize that many computed tomographic (CT) scans to diagnose them are likely unnecessary. We sought to measure the impact of renal CT scans on resource use and to justify a prospective study to derive a score that predicts an emergent diagnosis in patients with suspected UTS by doing so in our retrospective series.
Methods:
We conducted a retrospective study of ED patients who had noncontrast CT of the abdomen for suspected UTS. A split-sample was used to derive and validate a score to predict the presence of an emergent diagnosis on CT.
Results:
Of the 2,315 patients (50.8% female, mean age 45 years), 49 (2.1%) had an emergent outcome observed on CT. An additional 12 (0.5%) patients had an urgent outcome and 239 (10.6%) had a urologic procedure within 8 weeks of the CT. Serum white blood cell count, highest temperature, urine red blood cell count, and the presence of abdominal pain were significant predictors of the primary outcome. A score derived using these predictors had a potential range of 22 (0.26% predicted risk, 0.5% actual risk of the outcome) to 6 (52% predicted risk). The score was moderately discriminatory with c-statistics of 0.752 (derivation) and 0.668 (validation) and accurate with Hosmer-Lemeshow statistics of 10.553 (p = 0.228, derivation) and 9.70 (p = 0.286, validation).
Conclusions:
A sensible, relevant score derived and validated on all patients presenting with symptoms suggestive of renal colic could be useful in reducing abdominal CT scan ordering.
Rapid and wide dispersal of passengers after flights makes investigation of flight-related outbreaks challenging. An outbreak of Salmonella Heidelberg was identified in a group of Irish travellers returning from Tanzania. Additional international cases sharing the same flight were identified. Our aim was to determine the source and potential vehicles of infection. Case-finding utilized information exchange using experts' communication networks and national surveillance systems. Demographic, clinical and food history information was collected. Twenty-five additional cases were identified from Ireland, The Netherlands, Norway, USA and Canada. We conducted a case-control study which indicated a significant association between illness and consumption of milk tart (OR 10·2) and an egg dish (OR 6) served on-board the flight. No food consumed before the flight was associated with illness. Cases from countries other than Ireland provided supplementary information that facilitated the identification of likely vehicles of infection. Timely, committed international collaboration is vital in such investigations.
Experts have proposed removing obsessive–compulsive disorder (OCD) from the anxiety disorders section and grouping it with putatively related conditions in DSM-5. The current study uses co-morbidity and familiality data to inform these issues.
Method
Case family data from the OCD Collaborative Genetics Study (382 OCD-affected probands and 974 of their first-degree relatives) were compared with control family data from the Johns Hopkins OCD Family Study (73 non-OCD-affected probands and 233 of their first-degree relatives).
Results
Anxiety disorders (especially agoraphobia and generalized anxiety disorder), cluster C personality disorders (especially obsessive–compulsive and avoidant), tic disorders, somatoform disorders (hypochondriasis and body dysmorphic disorder), grooming disorders (especially trichotillomania and pathological skin picking) and mood disorders (especially unipolar depressive disorders) were more common in case than control probands; however, the prevalences of eating disorders (anorexia and bulimia nervosa), other impulse-control disorders (pathological gambling, pyromania, kleptomania) and substance dependence (alcohol or drug) did not differ between the groups. The same general pattern was evident in relatives of case versus control probands. Results in relatives did not differ markedly when adjusted for demographic variables and proband diagnosis of the same disorder, though the strength of associations was lower when adjusted for OCD in relatives. Nevertheless, several anxiety, depressive and putative OCD-related conditions remained significantly more common in case than control relatives when adjusting for all of these variables simultaneously.
Conclusions
On the basis of co-morbidity and familiality, OCD appears related both to anxiety disorders and to some conditions currently classified in other sections of DSM-IV.
To compare the school lunch consumption of Texas middle-school students with the 2009 Institute of Medicine's (IOM) school meal report recommendations. These new lunch menu patterns increase fruit to one serving and vegetables to two servings, with 50 % wholegrain food.
Design
Lunch food records were collected from middle-school students from four schools in south-east Texas in the spring of 2008, and entered into the Nutrition Data System for Research software. Average intake was calculated for those consuming meals according to the National School Lunch Program (NSLP; n 5414) and for those consuming lunch from other sources (n 239). The percentage of students selecting each food group was calculated.
Setting
Middle schools in south-east Texas.
Subjects
Middle-school students in south-east Texas.
Results
Students consuming NSLP meals reported consuming almost serving of fruit, serving of vegetables, 8 oz of milk and serving of whole grains at lunch. Non-NSLP consumers reported almost no intake of fruit, vegetables or milk, and consumed serving of whole grains at lunch. Among NSLP consumers, about 40 % selected and consumed a fruit serving. About two-thirds of students selected a vegetable, consuming about 67 %. Less than 4 % selected a dark green or orange vegetable.
Conclusions
Students’ lunch intake did not meet the new IOM recommendations. Few students selected dark green or orange vegetables, and only 40 % selected fruit. Whole grains consumption was low. Interventions with all stakeholders will be necessary to improve students’ food and beverage selections overall when school meal patterns are revised.
The geometry of the adult human mastoid air cell system has not previously been described over a large range of mastoid air cell volumes.
Methods:
Twenty subjects with a wide range of mastoid air cell pneumatised areas, as determined by X-ray, underwent computed tomography scanning of the middle ear. Mastoid air cell surface areas and volumes were then reconstructed from serial imaging sections, using Image J software.
Results:
Mastoid air cell volumes varied from 0.7 to 21.4 ml, and were linearly related to the pneumatised area. Right and left mastoid air cell volumes and surface areas were highly correlated. The mastoid air cell surface area was a linear function of volume.
Conclusion:
The relationship between mastoid air cell surface area and volume is similar over a wide range of volumes. Given that the rate of gas exchange across the mastoid air cell mucosa is related to the mastoid air cell surface area, that rate will thus also be a direct linear function of the mastoid air cell volume.
To test the effect of image size and presence of size cues on the accuracy of portion size estimation by children.
Design
Children were randomly assigned to seeing images with or without food size cues (utensils and checked tablecloth) and were presented with sixteen food models (foods commonly eaten by children) in varying portion sizes, one at a time. They estimated each food model’s portion size by selecting a digital food image. The same food images were presented in two ways: (i) as small, graduated portion size images all on one screen or (ii) by scrolling across large, graduated portion size images, one per sequential screen.
Setting
Laboratory-based with computer and food models.
Subjects
Volunteer multi-ethnic sample of 120 children, equally distributed by gender and ages (8 to 13 years) in 2008–2009.
Results
Average percentage of correctly classified foods was 60·3 %. There were no differences in accuracy by any design factor or demographic characteristic. Multiple small pictures on the screen at once took half the time to estimate portion size compared with scrolling through large pictures. Larger pictures had more overestimation of size.
Conclusions
Multiple images of successively larger portion sizes of a food on one computer screen facilitated quicker portion size responses with no decrease in accuracy. This is the method of choice for portion size estimation on a computer.