In spite of the growing literature about adult attention-deficit hyperactivity disorder (ADHD), relatively little is known about the prevalence and correlates of this disorder.

To estimate the prevalence of adult ADHD and to identify its demographic correlates using meta-regression analysis.

We used the MEDLINE, PsycLit and EMBASE databases as well as hand-searching to find relevant publications.

The pooled prevalence of adult ADHD was 2.5% (95% CI 2.1–3.1). Gender and mean age, interacting with each other, were significantly related to prevalence of ADHD. Metaregression analysis indicated that the proportion of participants with ADHD decreased with age when men and women were equally represented in the sample.

Prevalence of ADHD in adults declines with age in the general population. We think, however, that the unclear validity of DSM–IV diagnostic criteria for this condition can lead to reduced prevalence rates by underestimation of the prevalence of adult ADHD.

Behavioural and psychological symptoms of dementia (BPSD) are major contributors to the burden of dementia.

To describe the prevalence, correlates and course of BPSD in the population of England and Wales.

The prevalence of 12 symptoms was estimated in 587 participants with dementia and 2050 participants without dementia as part of a population-based longitudinal study of ageing. The effect of risk factors and the factor structure were estimated using 1782 interviews provided by participants with dementia throughout the study.

Each symptom apart from sleeping problems was more common in the population with dementia. The co-occurrence of the symptoms was explained by a four-factor solution, corresponding to psychosis/apathy, depression/anxiety, irritability/persecution and wandering/sleep problems. Psychosis occurred more frequently with declining cognition. Anxiety and depression were more common in younger individuals and in those with poor self-reported health. Persistence varied between symptoms.

Behavioural and psychological symptoms of dementia affect nearly all people with dementia. Symptoms co-occur, and the symptoms that affected individuals experience are related to their socio-demographic and clinical characteristics.

Little is known as to whether childhood temperament is associated with long-term sickness absence in adult life.

To explore the associations between childhood temperament and long-term sickness absence in middle age.

The Aberdeen Children of the 1950s study is comprised of 12 150 children born in Aberdeen 1950–55. Teachers completed the Aberdeen–London Child Behaviour Scale (Rutter B) for all participants in 1964. Current employment status was ascertained for 7183 (63.7%) in 2001.

Five and a half per cent of responders classified themselves as ‘permanently sick or disabled’ at follow-up. ‘Often complains of aches and pains’ (OR=6.75, 95% CI 1.28–35.5) and ‘Often appears miserable or unhappy’ (OR=3.81, 95% CI 1.01–14.4) were strongly associated with being permanently sick or disabled following adjustment for year of birth, gender, IQ and father's social class.

Childhood temperament is strongly associated with sickness absence in middle age.

Mild to moderate intellectual disability affects 2.5% of the general population and is associated with an increased risk of several psychiatric disorders. Most cases are of unknown aetiology although genetic factors have an important role.

To investigate the role of obstetric and neonatal complications in the aetiology of mild to moderate intellectual disability.

Obstetric and neonatal complications recorded at the time of pregnancy and delivery were compared between participants with mild to moderate intellectual disability, age-matched siblings and unrelated controls using logistic regression.

Admission to a special care baby unit and not being breastfed on discharge were more common in people with mild to moderate intellectual disability. Not being breastfed on discharge was also more common in those with intellectual disability than unaffected siblings. Foetal distress was more common among controls than among those with mild to moderate intellectual disability.

Admission to a special care baby unit and not being breastfed on discharge may be related to the aetiology of intellectual disability, although the direction of this association is unclear.

There is relatively little existing information regarding the neural correlates of deception in individuals with psychopathic traits.

To investigate the relationship between neural responses during deception and psychopathic personality traits in a sample of male participants drawn from the normal population.

Twenty-four male participants carried out a simple deception paradigm while undergoing functional magnetic resonance imaging. Psychopathic traits were assessed in the sample using the Psychopathic Personality Inventory (PPI).

Mean response times were greater for the lie than truth condition. Lie responses resulted in enhanced activation of the ventrolateral prefrontal cortex. The PPI sub-scales, coldheartedness, fearlessness, Machiavellian egocentricity, social potency and stress immunity were found to be correlated with activation patterns in the brain circuitry implicated in both deception and related processes such as behavioural restraint and social cognition.

This is a novel technology that may prove useful in our understanding of some of the key components of the psychopathy construct in both clinical and non-clinical contexts.

Diffusion tensor magnetic resonance imaging studies in schizophrenia to date have been largely inconsistent. This may reflect variation in methodology, and the use of small samples with differing illness duration and medication exposure.

To determine the extent and location of white matter microstructural changes in schizophrenia, using optimised diffusion tensor imaging in a large patient sample, and to consider the effects of illness duration and medication exposure.

Scans from 76 patients with schizophrenia and 76 matched controls were used to compare fractional anisotropy, a measure of white matter microstructural integrity, between the groups.

We found widespread clusters of reduced fractional anisotropy in patients, affecting most major white matter tracts. These reductions did not correlate with illness duration, and there was no difference between age-matched chronically and briefly medicated patients.

The finding of widespread fractional anisotropy reductions in our larger sample of patients with schizophrenia may explain some of the inconsistent findings of previous, smaller studies.

The presence of schizotypal personality traits in some people with bipolar disorder, together with reports of greater cognitive dysfunction in patients with a history of psychotic features compared with patients without such a history, raises questions about the nosological relationship between bipolar disorder with psychotic features and bipolar disorder without psychotic features.

To test the impact of a history of DSM–IV-defined psychosis on the neuropsychological status of participants with bipolar disorder while statistically controlling for confounding factors such as mood, medication, alcohol misuse/dependence and childhood abuse, and to evaluate the impact of schizotypal personality traits (and thus potential vulnerability to psychotic illness) on the cognitive performance of people with bipolar disorder and their healthy relatives.

Neuropsychological data were obtained for 25 participants with type I bipolar disorder and a history of psychosis, 24 with type I bipolar disorder but no history of psychosis and 61 unaffected relatives. Schizotypal traits were measured with the Schizotypal Personality Scale (STA). Childhood trauma was measured with the Childhood Trauma Questionnaire.

The group with a history of psychosis performed significantly worse than the healthy relatives on measures of verbal working memory, cognitive flexibility and declarative memory. Nevertheless, the two bipolar disorder groups did not differ significantly from each other on any cognitive measure. Scores on the STA were negatively associated with verbal working and declarative memory, but positively associated with visual recall memory.

‘Psychotic’ and ‘non-psychotic’ subtypes of bipolar disorder may lie on a nosological continuum that is most clearly defined by verbal memory impairment.

Tricyclic antidepressants and serotonin reuptake inhibitors are considered to be equally effective, but differences may have been obscured by internally inconsistent measurement scales and inefficient statistical analyses.

To test the hypothesis that escitalopram and nortriptyline differ in their effects on observed mood, cognitive and neurovegetative symptoms of depression.

In a multicentre part-randomised open-label design (the Genome Based Therapeutic Drugs for Depression (GENDEP) study) 811 adults with moderate to severe unipolar depression were allocated to flexible dosage escitalopram or nortriptyline for 12 weeks. The weekly Montgomery–Åsberg Depression Rating Scale, Hamilton Rating Scale for Depression, and Beck Depression Inventory were scored both conventionally and in a more novel way according to dimensions of observed mood, cognitive symptoms and neurovegetative symptoms.

Mixed-effect linear regression showed no difference between escitalopram and nortriptyline on the three original scales, but symptom dimensions revealed drug-specific advantages. Observed mood and cognitive symptoms improved more with escitalopram than with nortriptyline. Neurovegetative symptoms improved more with nortriptyline than with escitalopram.

The three symptom dimensions provided sensitive descriptors of differential antidepressant response and enabled identification of drug-specific effects.

The long-term efficacy of psychological interventions for bipolar disorders has not been tested.

This study assessed the efficacy of group psychoeducation to prevent recurrences and to reduce time spent ill for people with bipolar disorders.

A randomised controlled trial with masked outcome assessment comparing group psychoeducation and non-structured group intervention during 5-year follow-up. One hundred and twenty people with bipolar disorders were included in the study and 99 completed 5-year follow-up. Time to any recurrence, number of recurrences, total number of days spent ill, frequency and length of hospitalisations were the main outcome measures.

At the 5-year follow-up, time to any recurrence was longer for the psychoeducation group (log rank=9.953, P<0.002). The psychoeducation group had fewer recurrences (3.86 v. 8.37, F=23.6, P<0.0001) of any type and they spent less time acutely ill (154 v. 586 days,F=31.66, P=0.0001). The median number of days of hospitalisation per hospitalised participant was also lower for the psychoeducation group (45 v. 30,F=4.26, P=0.047).

Six-month group psychoeducation has long-lasting prophylactic effects in individuals with bipolar disorders. Group psychoeducation is the first psychological intervention showing such a long-term maintained efficacy in people with bipolar disorders.

Little is known about self-harm in the armed forces.

To investigate the characteristics of armed forces personnel presenting to a general hospital following self-harm and compare these with matched controls who had self-harmed.

Investigation of armed forces personnel presenting to hospital between 1989 and 2003 following self-harm and case–control comparison with people in the general population who had self-harmed.

One hundred and sixty-six armed forces personnel presented with self-harm during the study period, of whom 72.3% (120) were male. Nearly two-thirds (62.7%) were aged under 25 years. Relationship problems (62.0%), employment problems (43.9%) and alcohol misuse (40.5%) were common. Fewer armed forces personnel than controls had evidence of current or past psychiatric disorders or treatment or a prior history of self-harm, and their suicidal intent was lower (males only). Of 64 people in the armed forces who presented during the first 9 years of the study period, 1 had died (from natural causes) by the end of 2000, compared with 9 (5.1%) of the controls, 6 by probable suicide.

Self-harm by armed forces personnel may often be a response to interpersonal and employment problems complicated by alcohol misuse, with relatively low suicide intent.

Symptoms of attention-deficit hyperactivity disorder (ADHD) are known to persist into adulthood in the majority of cases.

To determine the prevalence of methylphenidate, dexamfetamine and atomoxetine prescribing and treatment discontinuation in adolescents and young adults.

A descriptive cohort study using the UK General Practice Research Database included patients aged 15–21 years from 1999 to 2006 with a prescription for a study drug.

Prevalence of prescribing averaged across all ages increased 6.23-fold over the study period. Overall, prevalence decreased with age: in 2006, prevalence in males dropped 95% from 12.77 per 1000 in 15-year-olds to 0.64 per 1000 in 21-year-olds. A longitudinal analysis of a cohort of 44 patients aged 15 years in 1999 demonstrated that no patient received treatment after the age of 21 years.

The prevalence of prescribing by general practitioners to patients with ADHD drops significantly from age 15 to age 21 years. The fall in prescribing is greater than the reported age-related decrease in symptoms, raising the possibility that treatment is prematurely discontinued in some young adults in whom symptoms persist.

Understanding trends in public attitudes towards people with mental illness informs the assessment of ongoing severity of stigma and evaluation of anti-stigma campaigns.

To analyse trends in public attitudes towards people with mental illness in England and Scotland using Department of Health Attitudes to Mental Illness Surveys, 1994–2003.

We analysed trends in attitudes for 2000 respondents in each survey year (6000 respondents in 1996 and 1997) using quota sampling methods and the adapted Community Attitudes Toward the Mentally Ill scale.

Comparing 2000 and 2003, there was significant deterioration for 17/25 items in England and for 4/25 items in Scotland. Neither country showed significant improvements in items between 2000 and 2003.

Public attitudes towards people with mental illness in England and Scotland became less positive during 1994–2003, especially in 2000–2003, and to a greater extent in England. The results are consistent with early positive effects for the ‘see me’ anti-stigma campaign in Scotland.