Maternal and paternal sensitivity: Key determinants of child attachment security examined through meta-analysis.

Sensitive caregiving behavior, which involves the ability to notice, interpret, and quickly respond to a child's signals of need and/or interest, is a central determinant of secure child-caregiver attachment. Yet, significant heterogeneity in effect sizes exists across the literature, and sources of heterogeneity have yet to be explained. For all child-caregiver dyads, there was a significant and positive pooled association between caregiver sensitivity and parent-child attachment (r = .25, 95% CI [.22, .28], k = 174, 230 effect sizes, N = 22,914). We also found a positive association between maternal sensitivity and child attachment security (r = .26, 95% CI [.22, .29], k = 159, 202 effect sizes, N = 21,483), which was equivalent in magnitude to paternal sensitivity and child attachment security (r = .21, 95% CI [.14, 27], k = 22, 23 effect sizes, N = 1,626). Maternal sensitivity was also negatively associated with all three classifications of insecure attachment (avoidant: k = 43, r = -.24 [-.34, -.13]; resistant: k = 43, r = -.12 [-.19, -.06]; disorganized: k = 24, r = -.19 [-.27, -.11]). For maternal sensitivity, associations were larger in studies that used the Attachment Q-Sort (vs. the Strange Situation), used the Maternal Behavior Q-Sort (vs. Ainsworth or Emotional Availability Scales), had strong (vs. poor) interrater measurement reliability, had a longer observation of sensitivity, and had less time elapse between assessments. For paternal sensitivity, associations were larger in older (vs. younger) fathers and children. These findings confirm the importance of both maternal and paternal sensitivity for the development of child attachment security and add understanding of the methodological and substantive factors that allow this effect to be observed. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Triadic communication with teenagers and young adults with cancer: a systematic literature review - 'make me feel like I'm not the third person'.

OBJECTIVES: Clinical communication needs of teenagers and young adults with cancer (TYACs) are increasingly recognised to differ significantly from younger children and older adults. We sought to understand who is present with TYACs, TYACs' experiences of triadic communication and its impact. We generated three research questions to focus this review: (1) Who is present with TYACs in healthcare consultations/communication?, (2) What are TYACs' experiences of communication with the supporter present? and (3) What is the impact of a TYAC's supporter being present in the communication? DESIGN: Systematic review with narrative synthesis. DATA SOURCES: The search was conducted across six databases: Medline, CINAHL, Embase, PsycINFO, Web of Science and AMED for all publications up to December 2023. ELIGIBILITY CRITERIA FOR SELECTING STUDIES: Included papers were empirical research published after 2005; participants had malignant disease, diagnosed aged 13-24 years (for over 50% of participants); the research addressed any area of clinical communication. DATA EXTRACTION AND SYNTHESIS: Three independent reviewers undertook full-text screening. A review-specific data extraction form was used to record participant characteristics and methods from each included paper and results relevant to the three review questions. RESULTS: A total of 8480 studies were identified in the search, of which 36 fulfilled the inclusion criteria. We found that mothers were the most common supporter present in clinical communication encounters. TYACs' experiences of triadic communication are paradoxical in nature-the supporter can help or hinder the involvement of the young person in care-related communication. Overall, young people are not included in clinical communication and decisions at their preferred level. CONCLUSION: Triadic communication in TYACs' care is common, complex and dynamic. Due to the degree of challenge and nuances raised, healthcare professionals need further training on effective triadic communication. PROSPERO REGISTRATION NUMBER: CRD42022374528.

Fathers' mental Ill-health and child maltreatment: A systematic review of the literature.

Background: Parental mental ill-health is often described as a risk factor for child maltreatment. Yet the literature commonly foregrounds maternal mental ill-health. To obtain a more complete picture, it is crucial to also understand the associations between fathers' mental health and child maltreatment. Aim: To provide a narrative synthesis of evidence about the relationship between fathers' mental health and child maltreatment. Method: Four electronic databases were searched, identifying 5479 citations. 151 studies were brought to full-text review. 37 were included in the study. Results: Studies revealed mixed evidence for associations between forms of paternal mental ill health and child maltreatment, with stronger evidence for paternal depression and weak or no evidence for PTSD and anxiety. Many confounding factors were identified across the papers. Discussion: The small number and limited range of good quality studies indicate the need to correct the relative invisibility of fathers within research about mental health and child maltreatment. At present, the available evidence is not sufficient to draw firm conclusions about the association between fathers' mental health and child maltreatment or appropriate policy and practice responses.

Attachment relationship quality with mothers and fathers and child temperament: An individual participant data meta-analysis.

A growing body of research suggests that, compared with single parent-child attachment relationships, child developmental outcomes may be better understood by examining the configurations of child-mother and child-father attachment relationships (i.e., attachment networks). Moreover, some studies have demonstrated an above-chance level chance of concordance between the quality of child-mother and child-father attachment relationships, and child temperament has been offered as a plausible explanation for such concordance. To assess whether temperament plays a role in the development of different attachment network configurations, in this preregistered individual participant data meta-analysis we tested the degree to which the temperament dimension of negative emotionality predicts the number of secure, insecure-avoidant, insecure-resistant, and disorganized attachment relationships a child has with mother and father. Data included in the linear mixed effects analyses were collected from seven studies sampling 872 children (49% female; 83% White). Negative emotionality significantly predicted the number of secure (d = -0.12) and insecure-resistant (d = 0.11), but not insecure-avoidant (d = 0.04) or disorganized (d = 0.08) attachment relationships. Nonpreregistered exploratory analyses indicated higher negative emotionality in children with insecure-resistant attachment relationships with both parents compared to those with one or none (d = 0.19), suggesting that temperament plays a small yet significant role in child-mother/child-father insecure-resistant attachment relationships concordance. Taken together, results from this study prompt a more in-depth examination of the mechanism underlying the small yet significantly higher chance that children with increased negative emotionality have for developing multiple insecure-resistant attachment relationships. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Configurations of mother-child and father-child attachment relationships as predictors of child language competence: An individual participant data meta-analysis.

An individual participant data meta-analysis was conducted to test pre-registered hypotheses about how the configuration of attachment relationships to mothers and fathers predicts children's language competence. Data from seven studies (published between 1985 and 2014) including 719 children (Mage : 19.84 months; 51% female; 87% White) were included in the linear mixed effects analyses. Mean language competence scores exceeded the population average across children with different attachment configurations. Children with two secure attachment relationships had higher language competence scores compared to those with one or no secure attachment relationships (d = .26). Children with two organized attachment relationships had higher language competence scores compared to those with one organized attachment relationship (d = .23), and this difference was observed in older versus younger children in exploratory analyses. Mother-child and father-child attachment quality did not differentially predict language competence, supporting the comparable importance of attachment to both parents in predicting developmental outcomes.

Experiences of emotional eating in an Acceptance and Commitment Therapy based weight management intervention (SWiM): A qualitative study.

BACKGROUND: Emotional eating is a barrier to weight management. Interventions based on Acceptance and Commitment Therapy (ACT) promote the acceptance of uncomfortable feelings, which can reduce the urge to use food as a coping mechanism. We aimed to explore how participants of an ACT-based weight management intervention (WMI) experience emotional eating and relevant intervention content. METHODS: We conducted semi-structured telephone interviews with participants of a digital ACT-based guided self-help WMI. Fifteen participants were purposefully selected to represent a range of demographic characteristics and emotional eating scores. We used reflexive thematic analysis to explore experiences of emotional eating. RESULTS: We generated five themes. Participants improved emotional eating by disconnecting emotions from behaviours though increased self-awareness (theme 1) and by implementing alternative coping strategies, including preparation, substitution, and acceptance (theme 2). Most participants maintained improvements in emotional eating over time but wished for more opportunities to re-engage with intervention content, including more immediate support in triggering situations (theme 3). Participants who struggled to engage with emotional eating related intervention content often displayed an external locus of control over emotional eating triggers (theme 4). The perceived usefulness of the intervention depended on participants' prior experiences of emotional eating, and was thought insufficient for participants with complex emotional experiences (theme 5). DISCUSSION: This ACT-based WMI helped participants with emotional eating by improving self-awareness and teaching alternative coping strategies. Intervention developers may consider adding ongoing forms of intervention that provide both real-time and long-term support. Additionally, a better understanding of how to support people with an external locus of control and people with complex experiences of emotional eating is needed. Future research may explore ways of personalising WMIs based on participants' emotional needs.

Strategies supporting parent-delivered rehabilitation exercises to improve motor function after paediatric traumatic brain injury: A systematic review.

AIM: To identify and analyse ways in which parents are supported to deliver rehabilitation exercises to their child after traumatic brain injury (TBI), conceptualized as strategies. METHOD: A systematic search was completed using seven online databases and three grey literature databases, from inception to November 2021. The included studies focused on physical rehabilitation in children after TBI with the involvement of parents as hands-on deliverers or facilitators of rehabilitation (e.g. supervising the exercise). Intervention descriptions were reviewed to identify strategies; this was followed by fine-grained analysis using the Behaviour Change Wheel to identify intervention components. Risk of bias was analysed using the revised Cochrane Risk-of-Bias Tool for Randomized Trials or the Risk Of Bias In Non-randomized Studies - of Interventions. RESULTS: Six interventions including 211 participants and one trial protocol met the inclusion criteria. All studies included a proportion of children diagnosed with TBI and four studies included mixed samples of acquired brain injury or cerebral palsy. All interventions included elements of goal setting and instruction. INTERPRETATION: Interventions focus heavily on the initiation of physical rehabilitation, but focus less on the longer-term maintenance of rehabilitation delivery. Further research should integrate perspectives from parents to inform the development of new interventions.

Trauma and loss in the Adult Attachment Interview: Situating the unresolved state of mind classification in disciplinary and social context.

This article examines how 'trauma' has been conceptualised in the unresolved state of mind classification in the Adult Attachment Interview, introduced by Main and Hesse in 1990. The unresolved state of mind construct has been influential for three decades of research in developmental psychology. However, not much is known about how this measure of unresolved trauma was developed, and how it relates to other conceptualisations of trauma. We draw on previously unavailable manuscripts from Main and Hesse's personal archive, including various editions of unpublished coding manuals, and on Main-Bowlby correspondence from the John Bowlby Archive at the Wellcome Trust in London. This article traces the emergence of the unresolved state of mind classification, and examines the assumptions about trauma embedded in the construct. These assumptions are situated both in the immediate context of the work of Main and Hesse and in terms of wider discourses about trauma in the period. Our analysis considers how a particular form of trauma discourse entered into attachment research, and in doing so partly lost contact with wider disciplinary study of trauma.

Traveller end of life care experiences and needs: thematic analysis.

OBJECTIVES: Travelling communities are a significant, but poorly understood, group of ethnic minorities known to experience inequalities in many aspects of healthcare, including at the end of life. This study explored the end of life care experiences and needs of Travellers, along with the perspectives of healthcare professionals. METHODS: Secondary thematic analysis of data from two focus groups and 16 interviews. Eighteen UK-based members of Travelling communities and three healthcare professionals took part in two focus groups. Sixteen hospice staff were interviewed. Data were collected by UK charity One Voice 4 Travellers in 2018. RESULTS: Tensions permeated the healthcare experience of Travellers. The perceived need for concealment of ethnic identity in the healthcare setting conflicted with participants' desire for personalised care and tailored services. Healthcare professionals' limited awareness of Travellers' cultural rituals around death led to difficulties, including misunderstandings relating to the large numbers of family gathered at the bedside of dying relatives in hospital and hospice settings. Approaches that could increase the acceptability of healthcare included Travellers working in liaison roles, increased provision of space for visiting family and cultural competency training for staff. However, challenges remain in converting ideal solutions into feasible changes. CONCLUSIONS: Improved communication and understanding between Travelling communities and healthcare professionals is needed to relieve the multilevel tensions experienced at the end of life. At an individual level, this would enable personalised care; at a systems level, cocreation of end of life care services with Travellers would help ensure that their cultural needs are met.

The relationship between attachment and posttraumatic stress in children and adolescents: A meta-analytic review.

The relationship between attachment and posttraumatic stress symptoms (PTSS) has been researched extensively within adult samples, with findings consistently demonstrating a relationship between insecure attachment and increased PTSS, and between secure attachment and decreased PTSS. To a lesser extent, such relationships have also been explored within child and adolescent samples. The evidence to date is equivocal and there have been no attempts to synthesize studies. This meta-analysis aimed to provide a quantitative synthesis of studies reporting a relationship between attachment orientation (on both developmental and social psychological measures) and PTSS within children and adolescents. A random effects model was used to pool 30 studies (N = 10,431) reporting exposure to a range of traumatic events including maltreatment and war trauma. Results demonstrate a negative correlation between secure attachment and PTSS (r = -.16) and a positive correlation between insecure attachment (r = .20), avoidant attachment (r = .20), anxious attachment (r = .32), and disorganized attachment (r = .17) and PTSS. These findings indicate a small but significant relationship between attachment and PTSS in children and adolescents. Exposure to maltreatment did not moderate the relationship between secure attachment and PTSS, though strengthened the relationship between insecure attachment and PTSS.

A meta-analysis of the distribution of preschool and early childhood attachment as assessed in the strange situation procedure and its modified versions.

This meta-analysis synthesized the distribution of attachment classifications as coded with the Cassidy-Marvin Preschool Attachment Coding System and the Main-Cassidy Six-Year-Old System. These systems have extended scholars' capacity to measure differences in the developing child-parent attachment relationship, and its sequelae, beyond the infancy period; however, the global distribution of the attachment categories in these systems, and the potential factors influencing this distribution, remain unknown. The meta-analysis included 97 samples (N = 8,186 children; 55% boys), mostly drawn from North American or European populations (89%; M = 76% White). Results indicated that the distribution of child-mother attachment was 53.5% secure, 14.0% avoidant, 11.0% ambivalent, and 21.5% disorganized/controlling. Moderator analyses showed that rates of security were lower, and rates of disorganization were higher, in samples of at-risk families, specifically when children were exposed to maltreatment. Variations in the procedure also moderated the distribution. The discussion calls for greater unity around methodological practices.

Demographic characteristics, long-term health conditions and healthcare experiences of 6333 trans and non-binary adults in England: nationally representative evidence from the 2021 GP Patient Survey.

OBJECTIVE: In order to address the lack of data on the health and healthcare needs of trans and non-binary adults, NHS England includes questions asking about both gender and trans status in its surveys to support quality improvement programmes.We used self-reported data from the GP Patient Survey to answer the research question: what are the demographic characteristics, health conditions and healthcare experiences of trans and non-binary adults in England? DESIGN/SETTING: Nationally representative, population-based cross-sectional survey in England with survey data collection from January to March 2021. PARTICIPANTS: 840 691 survey respondents including 6333 trans and non-binary adults. OUTCOMES: We calculated weighted descriptive statistics, and using logistic regression explored 15 long-term physical and mental health conditions, and 18 patient experience items, covering overall experience, access, communication and continuity. RESULTS: Trans and non-binary adults were younger, more likely to be from Asian, black, mixed or other ethnic groups and more likely to live in more deprived parts of the country. Age-specific patterns of long-term conditions were broadly similar among trans and non-binary adults compared with all other survey respondents, with some variation by condition. Overall, inequalities in long-term health conditions were largest for autism: OR (95% CI), 5.8 (5.0 to 6.6), dementia: 3.1 (2.5 to 3.9), learning disabilities: 2.8 (2.4 to 3.2) and mental health: 2.0 (1.9 to 2.2), with variation by age. In healthcare experience, disparities are much greater for interpersonal communication (OR for reporting a positive experience, range 0.4 to 0.7 across items) than access (OR range 0.8 to 1.2). Additionally, trans and non-binary adults report much higher preference for continuity 1.7 (1.6 to 1.8), with no evidence of any differences in being able to see or speak to a preferred general practitioner. CONCLUSION: This research adds up to date evidence about population demographics, health and healthcare needs to support healthcare improvement for trans and non-binary adults.

Socioemotional profiles of autism spectrum disorders, attention deficit hyperactivity disorder, and disinhibited and reactive attachment disorders: a symptom comparison and network approach.

Children with autism spectrum disorders (ASDs), attention deficit hyperactivity disorder (ADHD) and disinhibited and reactive attachment disorders (RAD/DAD) often experience socioemotional problems. Elucidating a clear picture of these profiles is essential. Strengths and Difficulties Questionnaires (SDQs) were analysed from cohort of children with ASD (n = 1430), ADHD (n = 1193), and RAD/DAD (n = 39). Kruskal-Wallis Tests and network analytic techniques were used to investigate symptom profiles. Children with ASD experienced more emotional problems, peer problems and fewer prosocial behaviours. Children with ADHD and RAD/DAD had higher levels of hyperactivity and conduct problems. Overall, ASD and ADHD networks were highly correlated (rs = 0.82), and we did not observe a statistically significant difference in terms of global Strength.

Editorial Perspective: On the need for clarity about attachment terminology.

Part of the appeal of attachment language is that it feels near to our everyday experience, as terms like 'attachment', 'security' or 'disorganisation' feel readily recognisable. Yet, not one of these terms is used by academic attachment researchers in line with ordinary language. This has hindered the evidence-based use of attachment in practice, the feedback loop from practice to research and the dialogue between attachment researchers in developmental psychology and in social psychology. This paper pinpoints the difficulties arising from the existence of multiple versions of 'attachment theory' that use exactly the same terms, held by communities that assume that they are referring to the same thing and with little infrastructure to help them discover otherwise. When we talk past one another, the different communities with a stake in knowledge of attachment are obstructed from genuinely learning from one another, drawing on their respective strengths and pursuing collaborations. One factor contributing to this situation has been the use of attachment terminology with technical meanings, but often without setting out clear definitions. We here introduce a guide to attachment terminology used by the academic community, which has recently been published on the website of the Society for Emotion and Attachment Studies. The guide is meant for researchers, clinicians and everyone concerned with attachment to increase understanding of the technical meaning of important terminology used by researchers, and support the quality of discussions between researchers, and between researchers and clinicians and other publics.

Exploring the meaning of unresolved loss and trauma in more than 1,000 Adult Attachment Interviews.

Unresolved states of mind regarding experiences of loss/abuse (U/d) are identified through lapses in the monitoring of reasoning, discourse, and behavior surrounding loss/abuse in response to the Adult Attachment Interview. Although the coding system for U/d has been widely used for decades, the individual indicators of unresolved loss/abuse have not been validated independently of the development sample. This study examined the psychometric validity of U/d, using individual participant data from 1,009 parent-child dyads across 13 studies. A latent class analysis showed that subsets of commonly occurring U/d indicators could differentiate interviewees with or without unresolved loss/abuse. Predictive models suggested a psychometric model of U/d consisting of a combination of these common indicators, with disbelief and psychologically confused statements regarding loss being especially important indicators of U/d. This model weakly predicted infant disorganized attachment. Multilevel regression analysis showed no significant association between ratings of unresolved other trauma and infant disorganized attachment, over and above ratings of unresolved loss/abuse. Altogether, these findings suggest that the coding system of U/d may have been overfitted to the initial development sample. Directions for further articulation and optimization of U/d are provided.

'Instruments are good at eliciting information; scores are very dangerous': The perspectives of clinical professionals regarding neurodevelopmental assessment.

LAY ABSTRACT: Autism and attention deficit hyperactivity disorder are common behaviourally diagnosed conditions. One of the key aspects of diagnosis is clinical judgement. Yet despite decades of research, it is only in recent times that researchers have started exploring clinicians' perspectives on diagnosing these conditions. We aimed to add to this body of knowledge by conducting interviews with 17 experienced health care professionals in the United Kingdom to hear their perspectives on diagnosing autism and attention deficit hyperactivity disorder. Clinicians reflected that for some children and young people, diagnosis is reasonably straightforward; however, in other situations, decisions are made on more pragmatic grounds (i.e. will this be helpful). We identified some differences of opinion between professionals and organisation which adds to the complexity of applying a diagnosis. We recommend several areas for future research and point to some practical and philosophical implications of the work.

A "transmission gap" between research and practice? A Q-methodology study of perceptions of the application of attachment theory among clinicians working with children and among attachment researchers.

Clinical practitioners are frequently encouraged, through literature, training, and policy, to learn, understand, refer to and use their knowledge of attachment theory and research when working to meet the needs of children and families. However, there has been very little empirical study of how practitioners understand and perceive the relevance of attachment concepts and methods. Q-methodology was used to examine the perceptions of attachment knowledge and its applications for practice among 30 UK clinicians working with children and an international group of 31 attachment researchers. Factor analysis revealed three perspectives, described as: i) pragmatic, developmental, and uncertain, ii) academic, and iii) autodidactic and therapeutic. Participants agreed on core tenants of theory, their aspirations for clinical practice and the inaccessibility of current assessment measures for practitioners. Yet they diverged on their understandings of attachment insecurity, disorganisation, and the implications of both for various aspects of child development.

The in-session discourse of unresolved/disorganized psychotherapy patients: An exploratory study of an attachment classification.

The Unresolved/disorganized (U/d) attachment classification has generated considerable interest among clinicians. This is in part based on its empirical associations with adult mental health, parenting practices, and treatment outcomes. Despite decades of theorizing, however, we have little empirical information regarding how patients with a U/d classification assigned by accredited coders actually behave or speak in psychotherapy sessions. Here, we take a step towards bridging this gap by reporting our observations of the psychotherapy session transcripts of 40 outpatients who were independently classified as U/d on the Adult Attachment Interview (AAI), the gold standard measure of adult attachment research. These patients were extracted from a larger sample of 181 and compared to others without a U/d classification. In this paper, we discuss two different discourse styles associated with a U/d classification. Some U/d patients did not seem to sufficiently elicit the therapist's endorsement of what they said. For example, they did not justify their claims with examples or explanations, or did not consider others' intentions or experiences. Other U/d patients were credible, but left the listener uncertain as to the underlying point of their discourse, for example, by glaringly omitting the consequences of their experiences, or interrupting their narratives mid-way. In the discussion, we place these observations in the context of recent thinking on attachment and epistemic trust, and discuss how this study may form the basis for future quantitative studies of psychotherapy.

Domestic violence and abuse in local child safeguarding policy: How is the problem represented?

Within the United Kingdom, domestic violence and abuse (DVA) is the most commonly identified factor within child in need assessments, with rates increasing in recent years in addition to 'lockdown'-related spikes. This article examines the representation of DVA in local child safeguarding policies using Bacchi's (2009) 'What is the problem represented to be?' approach. Policies were collected from the websites of all the child safeguarding partnerships of England in July 2021. In total, we identified 59 policies. These policies are designed to guide local responses to DVA across services and thus have potential for substantial impact on practice across health and social care. Our results suggest that local DVA policy in England exists within a conceptual framework which spotlights the individual and lacks attention to their context. We argue that these policies focus on adults, neglecting attention to children within their own safeguarding policies. This is through children being peripheralized within the conceptualisation of 'victim' and the assessed adult risk being used as a proxy measure for the risk to child. Demographic discussions build an image of DVA as an issue that can affect anyone, but with little acknowledgement of the vulnerabilities facing proportions of the population and their complexities - when such vulnerabilities are discussed, they are individualised and viewed in absence of their societal causes, potentially eclipsing critical elements of a child's experience of DVA. The implications of our results are wide-ranging but suggest a need to refocus on children and their context within local DVA policy.

Effectiveness and cost-effectiveness of referral to a commercial open group behavioural weight management programme in adults with overweight and obesity: 5-year follow-up of the WRAP randomised controlled trial.

BACKGROUND: There is evidence that commercially available behavioural weight management programmes can lead to short-term weight loss and reductions in glycaemia. Here, we aimed to provide the 5-year impact and cost-effectiveness of these interventions compared with a brief intervention. METHODS: WRAP was a non-blinded, parallel-group randomised controlled trial (RCT). We recruited from primary care practices in England and randomly assigned participants to one of three interventions (brief intervention, 12-week open-group behavioural programme [WW, formerly Weight Watchers], or a 52-week open-group WW behavioural programme) in an uneven (2:5:5) allocation. Participants were followed up 5 years after randomisation using data from measurement visits at primary care practices or a research centre, review of primary care electronic medical notes, and self-report questionnaires. The primary outcome was change in weight at 5 years follow-up, assessed using analysis of covariance. We also estimated cost-effectiveness of the intervention. This study is registered at Current Controlled Trials, ISRCTN64986150. FINDINGS: Between Oct 18, 2012, and Feb 10, 2014, we recruited 1269 eligible participants (two participants were randomly assigned but not eligible and therefore excluded) and 1040 (82%) consented to be approached about additional follow-up and to have their medical notes reviewed at 5 years. The primary outcome (weight) was ascertained for 871 (69%) of 1267 eligible participants. Mean duration of follow-up was 5·1 (SD 0·3) years. Mean weight change from baseline to 5 years was -0·46 (SD 8·31) kg in the brief intervention group, -1·95 (9·55) kg in the 12-week programme group, and -2·67 (9·81) kg in the 52-week programme. The adjusted difference in weight change was -1·76 (95% CI -3·68 to 0·17) kg between the 52-week programme and the brief intervention; -0·80 (-2·13 to 0·54) kg between the 52-week and the 12-week programme; and -0·96 (-2·90 to 0·97) kg between the 12-week programme and the brief intervention. During the trial, the 12-week programme incurred the lowest cost and produced the highest quality-adjusted life-years (QALY). Simulations beyond 5 years suggested that the 52-week programme would deliver the highest QALYs at the lowest cost and would be the most cost-effective. No participants reported adverse events related to the intervention. INTERPRETATION: Although the difference in weight change between groups was not statistically significant, some weight loss was maintained at 5 years after an open-group behavioural weight management programme. Health economic modelling suggests that this could have important implications to reduce the incidence of weight-related disease and these interventions might be cost-saving. FUNDING: The UK National Institute for Health and Care Research Programme Grants for Applied Research and the Medical Research Council.