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Family carers' distress and abusive behaviour: longitudinal study

Published online by Cambridge University Press:  02 January 2018

Claudia Cooper*
Affiliation:
Department of Mental Health Sciences, University College London, UK
Martin Blanchard
Affiliation:
Department of Mental Health Sciences, University College London, UK
Amber Selwood
Affiliation:
Department of Mental Health Sciences, University College London, UK
Zuzana Walker
Affiliation:
Department of Mental Health Sciences, University College London, UK
Gill Livingston
Affiliation:
Department of Mental Health Sciences, University College London, UK
*
Claudia Cooper, PhD, MRCPsych, Department of Mental Health Sciences, UCL, 67–73 Riding House Street, 2nd Floor, Charles Bell House, London W1W 7EJ, UK. Email: c.cooper@ucl.ac.uk
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Abstract

Background

A third of family carers of people with dementia report abusive behaviour towards the person for whom they are caring. This is the first longitudinal study to investigate such behaviour.

Aims

To test our hypotheses that carers' reports of abusive behaviour would increase over time, and that change in abuse scores would be predicted by change in anxiety and depression scores.

Method

In total, 131 (71.6%) of the family/friend dementia carers consecutively recruited from new referrals to Essex and London community mental health teams who were interviewed at baseline, completed the revised Modified Conflict Tactics Scale to measure abuse 1 year later.

Results

Sixty-three (48.1%) of the carers reported any abusive behaviour at baseline compared with 81 (61.8%) a year later (χ2 = 6.9, P = 0.009). An increase in abuse scores was predicted by an increase in anxiety and depressive symptoms (respectively ß = 0.32, t = 3.9, P<0.001 and ß = 0.24, t = 2.9, P = 0.005), and by less domiciliary care at baseline (ß = –0.18, t =–2.2, P = 0.031).

Conclusions

Most abusive behaviour reported by carers at baseline persisted or worsened in the following year, despite contact with specialist services. We suggest that trials of psychological interventions shown to reduce anxiety and depression in the carers of people with dementia are needed to determine whether they also reduce elder abuse, and can be delivered cost-effectively within the National Health Service (NHS).

Type
Papers
Copyright
Copyright © Royal College of Psychiatrists, 2010 

Abusive behaviour is commonly reported by carers of people with dementia. We previously reported in the CARD (Caring for Relatives with Memory Disorders) study that a third of family carers of people referred to psychiatric secondary care described significant levels of abuse, and half some abusive behaviour. Reference Cooper, Selwood, Blanchard, Walker, Blizard and Livingston1 These rates were comparable with other studies of abuse reported by family carers of people with dementia. Reference Cooper, Selwood and Livingston2 Elder abuse is defined as a single or repeated act or lack of appropriate action occurring within any relationship where there is an expectation of trust, which causes harm or distress to an older person. 3

The National Dementia Strategy 4 outlines the government's 10-year plan to improve the quality of care for people with dementia and their carers. Good-quality care should include prevention of abuse, but currently there are no evidence-based interventions, possibly because a dearth of research exploring the causes of elder abuse prevents their development. Higher levels of abuse were associated with higher carer anxiety and depression in our study of family carers for people with dementia Reference Cooper, Selwood, Blanchard, Walker, Blizard and Livingston5 and a US study in a convenience sample of frail older adults and their carers. Reference Beach, Schulz, Williamson, Miller, Weiner and Lance6,Reference Shaffer, Dooley and Williamson7

No previous longitudinal study has investigated the prevalence of elder abuse, so we do not know whether these abusive acts tend to persist or worsen over time, or whether after diagnosis and interventions they tend to improve. We know that levels of anxiety and depression in carers of people with dementia tend to increase over time. Reference Cooper, Katona, Orrell and Livingston8 We hypothesise that anxiety and depression lead to carers acting more abusively, because they view the current or future situation more negatively or are less able to cope with the demands of caring or to ask for help. If this is so, we would expect carers in general also to report more abusive behaviour over time and for this to be predicted by increasing anxiety and depression.

In the current study, we measured the prevalence of abusive behaviour 1 year after our initial survey and which took place among carers of people with dementia consecutively referred to secondary services. We tested our hypotheses that carers' reports of abusive behaviour would increase over time, and that change in abuse scores would be predicted by change in anxiety and depression scores, after considering potential confounders.

Method

Setting and participants

At baseline, we recruited consecutively referred family carers of people with a clinical diagnosis of dementia; living at home and referred to community mental health teams covering London and Essex. They included inner city, suburban and rural areas. We defined a family carer as providing care for ≥4 h a week. Recruitment took place between January 2007 and May 2008. Interviews were at a time and place convenient to the carer, usually their home.

Data collection

The study received research ethics committee approval. Participants gave written informed consent. The information sheet specified that ‘we respect confidentiality but cannot keep it a secret if anyone is being seriously harmed’. Care recipients were asked for consent to access their medical notes, but not interviewed. Where the person with dementia lacked capacity to consent (as judged from their psychiatrist and carer's reports), we asked carers whether they thought that the individual would have agreed when they had capacity. Three experienced psychiatrists carried out baseline interviews between January 2007 and April 2008.

The first author (C.C.) contacted the participants 1 year after they had participated, unless the care recipient was known to have died. Participants were asked whether they were still in regular contact with the person they were caring for a year ago, and if so they were asked to complete a follow-up interview. Four participants asked to complete the questionnaire as an interview, two face to face and two by telephone; the remainder replied by post. The questionnaire was re-sent once if no response had been received within a month of the first mailing.

Baseline measures

We collected sociodemographic data on: carer and care recipient age, gender, ethnicity, marital status, qualifications and alcohol use; relationship to the person being cared for (spouse, child, other); hours caring per week over preceding few weeks (recorded as 168 if the co-resident carer reported caring all the time and could not leave); care recipient's accommodation; and whether the carer worked.

Modified Conflict Tactics Scale

Our main outcome measure was the validated Modified Conflict Tactics Scale (MCTS), Reference Cooper, Manela, Katona and Livingston9,Reference Beach, Schulz, Williamson, Miller, Weiner and Lance10 asking how often in the past 3 months they had acted in each of five psychologically and five physically abusive ways towards the person with dementia on a Likert scale from 0 to 4 (never, almost never, sometimes, most of the time, all the time). A score of ≥2 (sometimes) on any question denotes significant abuse. We used the total abuse score in our analyses. The psychological abuse items asked were whether they had: screamed or shouted at the care recipients, used a harsh tone of voice, insulted, swore at them or called them names; threatened to send them to a care home, to stop taking care of or abandoning them; or used physical force on them. The physical abuse items were: whether they had been afraid they might hit or hurt them, whether they had withheld food, hit or slapped, shaken or handled them roughly in other ways. We have previously reported that the MCTS was acceptable and had good convergent and discriminant validity and internal consistency for measuring abusive behaviour by carers of people with dementia, and was much better than observer-reported measures at detecting abuse. Reference Cooper, Manela, Katona and Livingston9 To minimise bias, the MCTS was completed by the carer, unless they were unable to do so, in which case the researcher read out the questions and the possible responses and recorded their answers. We have directly compared objective measures of detecting elder abuse, which ask assessors to look for signs of abuse, with carer self-report measures, and found the latter to be more sensitive. Reference Cooper, Manela, Katona and Livingston9 The MCTS is not designed to detect abusive behaviour that the carer wishes to hide, although the relatively high proportion of carers reporting abuse suggests it is good at enabling people to divulge abuse.

Other measures

Carers also completed the following validated measures.

Hospital Anxiety and Depression Scale. The Hospital Anxiety and Depression Scale (HADS) Reference Zigmond and Snaith11,Reference Bjelland, Dahl, Haug and Neckelmann12 has previously been used for carers of people with dementia. It does not include somatic items (which can be misleading in older people) and has been validated throughout the age range and in all settings to identify clinically significant anxiety and depression. Reference Bjelland, Dahl, Haug and Neckelmann12 It assesses how the person has been feeling within the past week. It consists of two seven-item subscales, each score 0–3, which generate scores for generalised anxiety and depression (0–21).

The Brief Coping Orientations to Problems Experienced (COPE) scale. This is a self-report questionnaire with 14 subscales describing different coping strategies (with two items per scale). Reference Carver13 Carers were asked to score each strategy from 1 (not doing it at all) to 4 (doing it a lot). We used three subscales of the COPE for which adequate psychometric properties in dementia carers are reported: Reference Cooper, Katona and Livingston14 problem-focused (active coping, instrumental support and planning), emotion-focused (acceptance, emotional support, humour, positive reframing and religion) and dysfunctional coping (behavioural disengagement, denial, self-distraction, self-blame, substance use and venting).

Zarit Burden scale. The Zarit Burden scale Reference Zarit, Reever and Bachpeterson15 for carer burden is a 22-item self-report questionnaire and is the most consistently used measure of carer burden. It has a high internal consistency and construct validity. Reference Hebert, Levesque, Vezina, Lavoie, Ducharme and Gendron16 ‘Carer burden’ may be divided into the physical, psychological, social and financial demands of caring for someone, or into ‘subjective’ and ‘objective’ burden, with subjective burden referring to the emotional consequences of caregiving.

Health Status Questionnaire (HSQ–12). This is a quality-of-life instrument and it is valid and reliable throughout the adult age range and three of its domains measure physical health: health perception, role physical and physical functioning. Reference Radosevich and Pruitt17,Reference Pettit, Livingston, Manela, Kitchen, Katona and Bowling18 For health perception, carers were asked to rate their health on a Likert scale from 1 (excellent) to 5 (poor). For physical functioning, they were asked about how their health limited activities such as climbing stairs, a higher score indicating fewer physical limitations. For impact on activities, people were asked how their physical health problems limited them in their daily activities, and asked to score this on a five-point Likert scale, from ‘limited a little’ to ‘a great deal’.

Carers were asked about their life events in the past 6 months using the List of Threatening Experiences. Reference Brugha, Bebbington, Tennant and Hurry19 Finally, they were asked about how rewarding their relationship with the care recipients was before the onset of memory problems, using a four-item measure of relationship rewards for which reliability in dementia carers is reported. Reference Williamson and Shaffer20

Additional measures. Carers were also asked to complete the Alzheimer's Disease Co-operative Study Inventory – activities of daily living (ADCS–ADL) scale, Reference Galasko, Bennett, Sano, Ernesto, Thomas and Grundman21 and the Neuropsychiatric Inventory (NPI) to measure neuropsychiatric symptoms. Reference Cummings22 Carers completed the MCTS (see above), modified to include abusive behaviour by the care recipients towards them. We asked when the care recipients first had memory problems and the number of alcohol units they drank per week. We recorded the care recipients' service receipt using the Client Service Receipt Inventory, Reference Knapp23 and calculated hours of community healthcare; in-home and out-of-home social care; and days in hospital for the preceding 3 months. We asked carers about the current physical health problems of the person receiving care. We obtained the most recent Mini-Mental State Examination (MMSE) Reference Folstein, Folstein and McHugh24 score and medications from the care recipients' medical notes.

Follow-up interview

Carers were asked whether the person they cared for was now living in 24-hour care, and to complete again the measures of abusive behaviour towards the care recipient, anxiety and depression.

Data analysis

We compared sociodemographic and morbidity characteristics of those interviewed at baseline who took part in the follow-up interview with those who did not. We compared anxiety, depression and abuse scores between baseline and 1-year follow-up, and the proportion of carers reporting any abuse and scoring as abuse cases using appropriate univariate tests, and calculated the change in each of these scores over this time.

We explored the univariate relationship between change in abuse score and sociodemographic, carer and care recipients' characteristics at baseline, and anxiety and depression change scores. We transformed the two variables entered into the multivariate analyses that had a skew statistic >1 or < –1 before the regression analysis (to log of variable +1). These were: length of memory problems and in-home social care (post transformation skew statistics were –0.25, s.d. = 0.21 and 0.91, s.d. = 0.21 respectively). We conducted a forwards linear regression with change in abuse score as the dependent variable. We entered all the characteristics studied that approached significance (P<0.1) in their relationship with change in abuse score.

Results

In total, 220/319 (69%) of eligible carers participated in baseline interviews, 99 refused or were uncontactable. There were no differences between participants and non-participants in care recipient or carer gender (χ2 = 1.3, P = 0.26: χ2 = 0.0, P = 1.00), whether they lived together (χ2 = 2.2, P = 0.14) or the relationship (partner, child or other) between them (χ2 = 2.7, P = 0.26).

At 1 year, 28 dyads did not complete the questionnaire because the person with dementia had died, 1 because the carer had died, and 8 because they no longer saw the person with dementia frequently. Of the 183 remaining carers who were eligible for follow-up, 131 (71.6%) completed the follow-up questionnaire. These 131 carers did not differ from the 89 non-participants in terms of care recipients' gender (χ2 = 0.31, P = 0.58), carer gender (χ2 = 0.05, P = 0.83), relationship between them (spouse, child or other) (χ2 = 2.8, P = 0.25) and whether they lived together (χ2 = 0.04, P = 0.95). There were also no differences in baseline scores on the NPI (Mann–Whitney U-test = 5147.0, P = 0.14), MMSE (U = 4658.5, P = 0.10), ADL scale (t = 0.50, P = 0.62), carer abusive behaviour scale (U = 5164.0, P = 0.13), burden (t = 0.15, P = 0.88), anxiety (t =0.51, P = 0.61) or depression scores (t =0.83, P = 0.41). There were also no differences between those who took part in the follow-up and those who did not in terms of their use of problem-focused (t = –0.08, P = 0.94), emotion-focused (t =0.51, P = 0.61) or dysfunctional coping strategies (U = 5784.5, P = 0.92). In the rest of the analyses, we included only the 131 carers who completed the follow-up measures.

Univariate analyses

Mean scores were higher at follow-up on measures of carer abusive behaviour: mean 1.8 (s.d. = 2.1) v. 1.3 (s.d. = 1.8) at baseline (Wilcoxon signed-rank test statistic z = 2.9, P = 0.003); depression (6.0 (s.d. = 4.3) v. 4.9 (s.d. = 4.4) z = 3.4, P = 0.001) and anxiety (8.2 (s.d. = 4.4) v. 6.3 (s.d. = 4.3)); paired t-test = 4.9, P<0.001). In total, 41 (31.5%) carers scored as abuse cases at baseline compared with 45 (34.4%) 1 year later (McNemar's test χ2 = 0.11, P = 0.74), and 63 (48.1%) of carers reported any abusive behaviour at baseline compared with 81 (61.8%) a year later (χ2 = 6.9, P = 0.009).

Of the baseline sociodemographic characteristics studied, only the recipients of care without qualifications were associated with change in abuse score (0.68 (s.d. = 1.9) increase v. 0.13 (s.d. = 1.8) decrease in those caring for people with qualifications (Table 1)).

Table 1 Categorical sociodemographic characteristics and their relationship with change in abuse score over 1 year

Category n (%) (n = 131) Test statistic P
Care recipients
Female 97 (74.0) t = 0.83 0.41
Ethnicity: White, UK 105 (80.2) t = 1.1 0.26
Living with carer 71 (54.2) t = 0.81 0.42
Accommodation at baseline F = 0.94 0.51
    Home owner 76 (58.0)
    Renting 43 (32.8)
    Sheltered 12 (9.2)
Entered care home during follow-up year 18 (13.7) t = 1.1 0.29
Married/cohabiting 56 (42.7) t = 0.02 0.98
No qualifications 101 (77.1) t = 2.1 0.038
Carer
Female 87 (66.4) t = 1.3 0.20
Ethnicity: White, UK 109 (83.2) t = 0.01 0.99
Relationship to care recipient F = 0.61 0.83
    Spouse 48 (36.6)
    Child 69 (52.7)
    Other relative or friend 14 (10.7)
Married/cohabiting 97 (74.0) t = 1.1 0.30
Qualifications F = 0.94 0.51
    None 45 (34.4)
    O-level 34 (26.0)
    A-level 25 (19.1)
    Degree + 27 (20.6)
Working F = 1.1 0.36
    No 83 (63.4)
    Part time 19 (14.5)
    Full time 29 (22.1)

A greater increase in abuse score was also associated with a shorter duration of memory problems, receiving fewer hours of in-home social care at baseline and increases in depression and anxiety scores (Table 2).

Table 2 Characteristics of sample and correlations with change in abuse score

Characteristics Mean (s.d.) Median (range) Skewness statistic Correlationa P
Sociodemographic factors
    Care recipient age 81.2 (7.6) 82 (58 to 95) -0.79 0.09 0.53
    Carer age 62.8 (12.6) 61 (32 to 92) 0.17 0.08 0.37
    Hours of care provided a week 98.4 (76.1) 168 (4 to 168) -0.21 0.05 0.55
Care recipient morbidity
    Mini-Mental State Examination (n = 127) 19.0 (6.5) 20.0 (0 to 29) -1.310 -0.04 0.68
    Neuropsychiatric Inventory 16.7 (14.5) 14 (0 to 69) 1.19 -0.08 0.39
    ADCS—ADL 19.6 (12.8) 17 (0 to 54) 0.59 -0.10 0.28
    Abusive behaviour to carer score 2.0 (3.1) 0 (0 to 14) 2.01 -0.12 0.19
    Number of physical illnesses 2.5 (1.5) 2 (0 to 7) 0.51 -0.02 0.80
    Number of medications 4.4 (3.1) 4 (0 to 16) 0.90 0.11 0.23
    Months with memory problems 36.1 (42.0) 24 (0 to 300) 3.40 -0.19 0.032
    Units of alcohol per week 3.8 (10.2) 0 (0 to 84) 4.94 0.01 0.92
Hours of formal care in past 3 months
    In-home social care 40.0 (97.5) 0 (0 to 624) 3.59 -0.17 0.055
    Social care outside home 17.6 (80.8) 0 (0 to 845) 8.67 -0.06 0.49
    Healthcare 4.4 (11.9) 1.8 (0.2 to 107) 6.7 -0.06 0.50
Carer factors (baseline)
    Health perception 2.7 (1.2) 3 (1 to 5) 0.23 0.09 0.33
    Role physical 1.9 (1.2) 1 (1 to 5) 1.09 0.07 0.42
    Physical functioning 2.6 (0.64) 3 (1 to 3) -1.30 -0.10 0.27
    Burden score 29.6 (16.3) 29 (0 to 84) 0.56 -0.09 0.29
    Life events 0.53 (0.78) 0 (0 to 3) 1.40 0.06 0.48
    COPE dysfunctional 17.6 (5.2) 16 (12 to 41) 1.42 -0.09 0.36
    COPE emotion-focused 21.0 (5.5) 21 (10 to 38) 0.31 -0.10 0.26
    COPE problem-focused 14.7 (4.9) 15 (6 to 24) 0.11 -0.12 0.16
    Units of alcohol 3.8 (10.2) 0 (0 to 84) 4.94 0.06 0.50
    Previous relationship rewards (n = 128) 9.5 (2.9) 11 (1 to 12) -0.95 0.07 0.41
Carer factors (change from baseline to 1 year)
    Anxiety 1.87 (4.4) 2 (-9 to 16) 0.26 0.34 < 0.001
    Depression 1.15 (4.3) 1 (-19 to 10) -0.76 0.27 0.002

Multivariate analysis

We entered change in anxiety score and all other characteristics that approached significance (P<0.1) in their relationship with change in abuse score, in a forwards linear regression, with change in abuse score as a dependent variable. Table 3 shows the correlation matrix for variables included. Changes in anxiety and depression scores were highly correlated, so were not included in the same equation.

Table 3 Correlation matrix for variables entered in final regression model

Correlation coefficient (P)
Change in abuse score Change in anxiety score Change in depression score Time with memory problems Care recipients having qualifications
Change in anxiety score 0.34 (< 0.001)
Change in depression score 0.27 (0.002) 0.60 (< 0.001)
Time with memory problemsa -0.19 (0.032) 0.07 (0.46) 0.08 (0.35)
Care recipients having qualificationsa -0.12 (0.17) -0.14 (0.11) 0.04 (0.64) 0.03 (0.74)
In-home social carea -0.17 (0.055) -0.07 (0.43) -0.10 (0.25) 0.18 (0.04) -0.03 (0.75)

Only an increase in anxiety score (standardised β = 0.32, t = 3.9, P<0.001) and less in-home social care at baseline (β = –0.18, t = –2.2, P = 0.031) were associated with an increase in abuse score (adjusted R2 = 0.13). We repeated the above analysis including change in depression rather than anxiety score. The significant predictors were an increase in depression score (β = 0.24, t = 2.9, P = 0.005), less in-home social care at baseline (β = –0.19, t = –2.3, P = 0.025) and the care recipients having more qualifications at baseline (β = –0.18, t = –2.2, P = 0.028) (adjusted R2 = 0.12).

Discussion

Around half of carers reported any abusive behaviour at baseline, and this had increased to nearly two-thirds a year later. Most abusive behaviour reported by carers at baseline persisted or worsened in the following year, despite their contact with specialist services. Our findings suggest that current dementia services are not adequately addressing carer abusive behaviour among people with dementia living at home, and that targeted interventions are needed.

The increase in carer abusive behaviour over a year was strongly predicted by an increase in depression and anxiety symptoms. Perhaps carers who felt they had lost the person they knew to dementia were more anxious and depressed, and also more likely to abuse. Alternatively, carer anxiety and depression may have been associated with a lack of confidence in their ability to care, and thus greater use of abusive rather than more helpful strategies for managing difficulties. Anxiety and depression may also have lowered the ability of carers to manage difficulties that arose, so they were more likely to feel overwhelmed and react abusively.

This is the first longitudinal study to explore the relationship between carer mental health and abusive behaviour. We only measured abuse, anxiety and depression at baseline and 1 year. We cannot determine whether onset of abusive behaviour occurred before or after anxiety or depressive symptoms from this study design. Therefore, although we explored change over time in these scores, and demonstrated our hypothesis that change in abusive behaviour was predicted by change in anxiety and depression, it is also possible that abusive behaviour led to anxiety and depression. It is plausible that guilt should arise from abusive acts, or that worry regarding the consequences of abuse could lead to carer anxiety and depression.

The National Institute for Health and Clinical Excellence and the Social Care Institute for Excellence dementia care clinical guidelines recommend that ‘Carers of people with dementia who experience psychological distress and negative psychological impact should be offered psychological therapy, including cognitive behavioural therapy, conducted by a specialist practitioner’. 25 In reality, resources are not available, although there is a recent precedent for broadening availability of psychological interventions. In 2008, the UK Department of Health unveiled plans to train an extra 3600 psychological therapists to treat depression and anxiety in primary care, with training and supervision from clinical psychologists. 26 Such a model could also be employed to deliver psychological therapies adapted for carers of people with dementia. These may include interventions to encourage use of helpful coping strategies, and discourage unhelpful strategies, when managing the problems in caring for someone with dementia. Reference Gallagher-Thompson, Coon, Solano, Ambler, Rabinowitz and Thompson27 As levels of anxiety, depression and abusive behaviour in dementia carers increased over time, with nearly two-thirds reporting any abusive behaviour at follow-up, such interventions could usefully be offered to all family carers of people newly diagnosed with dementia.

Such a programme would be expensive and would need careful piloting to include an evaluation of the benefits and cost-effectiveness of implementation. There is good evidence from the USA that manualised psychological interventions can improve the mental health of dementia carers. Reference Gallagher-Thompson, Arean, Rivera and Thompson28 We think these need to be evaluated urgently to determine whether they can be effectively delivered across the National Health Service (NHS). Our findings suggest that tackling carer anxiety and depression may also reduce abusive behaviour by carers, but further work is needed to test this hypothesis. There is also evidence from the USA that providing specialist, individually tailored psychological support to people with dementia and their family carers can reduce rates of institutionalisation. Reference Mittelman, Roth, Clay and Haley29 Elder abuse has been associated with a greater likelihood of an older person moving to a care home, Reference Moon, Lawson, Carpiac and Spaziano30 although we did not find this in our sample, possibly because of decreased power to detect this. Nationally, a reduction in carehome placements would have huge benefits for society because most older people want to continue living at home and report higher quality of life when they do so, compared with those placed in care homes. There are also economic benefits; the National Audit Office recently emphasised the need to ‘spend to save’ on dementia care. 4

Receiving fewer hours of in-home social care at baseline was also associated with an increase in abuse score. This included care worker, social worker and in-home respite time. This suggests that in-home services may be particularly important in reducing abuse, although it is also possible that this relationship is confounded, as people with dementia who have more behavioural and psychological symptoms of dementia are less likely to accept home care and, as they are more difficult to care for, their carers may be more stressed and therefore act more abusively.

Limitations

We measured service use at baseline but not at follow-up. We therefore do not know how this may have changed over the year, and it is possible that loss of services may have lead to anxiety, depression and abusive behaviour in some carers. This does not alter our finding that change in affective symptoms predicted change in abusive behaviour. Just under a third of carers approached refused to participate in the study. This compares positively with response rates in recent large general population surveys; 57% of people approached for the 2007 Adult Psychiatric Morbidity Survey agreed to take part, Reference McManus, Meltzer, Brugha, Bebbington and Jenkins31 suggesting that carers were not dissuaded from taking part because of the nature of the interview. Nonetheless, this is a limitation as we do not know whether those who refused to take part would have been more or less likely to report abuse. As the information sheet explained that confidentiality may be breached if someone was being harmed, it is perhaps more likely that those who were abusing would refuse follow-up. Similarly, the carers who completed the baseline interview but did not return the follow-up questionnaire may have been more stressed, or more likely to be acting abusively than those who did return it. Most of the carers completed the first assessment at interview and the second in a postal survey. They may have been more willing to disclose abuse by post. There may be other factors we have not considered that confound or explain the relationship between abuse and psychological morbidity.

Funding

The study was funded by a Medical Research Council research training fellowship awarded to C.C.

Acknowledgements

We would like to thank the carers and patients who took part in the study. We are grateful to Camden and Islington NHS Foundation Trust, North Essex Partnership Foundation NHS Trust and North East London Mental Health Trust; in particular to Drs Allen, Joels, Kirchner and Stevens. We would like to thank Dr Colm Owens for conducting some of the interviews and the Alzheimer's Society (Islington Branch) and Shirley Nurock for her assistance in developing the study.

Footnotes

Declaration of interest

None.

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Figure 0

Table 1 Categorical sociodemographic characteristics and their relationship with change in abuse score over 1 year

Figure 1

Table 2 Characteristics of sample and correlations with change in abuse score

Figure 2

Table 3 Correlation matrix for variables entered in final regression model

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