Saturation has attained widespread acceptance as a methodological principle in qualitative research. It is commonly taken to indicate that, on the basis of the data that have been collected or analysed hitherto, further data collection and/or analysis are unnecessary. However, there appears to be uncertainty as to how saturation should be conceptualized, and inconsistencies in its use. In this paper, we look to clarify the nature, purposes and uses of saturation, and in doing so add to theoretical debate on the role of saturation across different methodologies. We identify four distinct approaches to saturation, which differ in terms of the extent to which an inductive or a deductive logic is adopted, and the relative emphasis on data collection, data analysis, and theorizing. We explore the purposes saturation might serve in relation to these different approaches, and the implications for how and when saturation will be sought. In examining these issues, we highlight the uncertain logic underlying saturation—as essentially a predictive statement about the unobserved based on the observed, a judgement that, we argue, results in equivocation, and may in part explain the confusion surrounding its use. We conclude that saturation should be operationalized in a way that is consistent with the research question(s), and the theoretical position and analytic framework adopted, but also that there should be some limit to its scope, so as not to risk saturation losing its coherence and potency if its conceptualization and uses are stretched too widely.

This study highlights the complicated nature of the diagnosis and management of late-life depression. Protocols for the diagnosis and treatment of depression emphasis the biomedical model which does not fit with the everyday experience of GPs or elderly patients who share the views of primary care professionals that depression is a consequence of social and contextual issues. There is a need for the development of evidence-based provision for older people with depression within primary care, but also a need for elderly patients to be made aware of the legitimacy of presenting low mood and misery to their primary care professional.

Depression in older people is common, under-recognised and often undertreated. This study aimed to explore the reasons why older people with depression may not present to primary care. Secondary analysis was carried out, of qualitative data collected in two previous studies in North-West England. Older people are reluctant to recognise and name 'depression' as a set of symptoms that legitimises attending their general practitioner (GP). They do not consider themselves candidates for help for their distress. This is partly due to perceptions of the role of the GP but also to previous negative experiences of help seeking. In addition, treatments offered, which are predominantly biomedical, may not be acceptable to older people. Interventions offered to older people need to encourage social engagement, such as befriending, and enhancement of creative, physical and social activity.

BackgroundPsychological therapy is effective for symptoms of mental distress, but many groups with high levels of mental distress face significant barriers in terms of access to care, as current interventions may not be sensitive to their needs or their understanding of mental health. There is a need to develop forms of psychological therapy that are acceptable to these groups, feasible to deliver in routine settings, and clinically and cost effective.MethodsWe developed a culturally sensitive wellbeing intervention with individual, group and sign-posting elements, and tested its feasibility and acceptability for patients from ethnic minorities and older people in an exploratory randomised trial.ResultsWe recruited 57 patients (57% of our target) from 4 disadvantaged localities in the NW of England. The results of the exploratory trial suggest that the group receiving the wellbeing interventions improved compared to the group receiving usual care. For elders, the largest effects were on CORE-OM and PHQ-9. For ethnic minority patients, the largest effect was on PHQ-9. Qualitative data suggested that patients found the intervention acceptable, both in terms of content and delivery.ConclusionsThis exploratory trial provides some evidence of the efficacy and acceptability of a wellbeing intervention for older and ethnic minority groups experiencing anxiety and depression, although challenges in recruitment and engagement remain. Evidence from our exploratory study of wellbeing interventions should inform new substantive trial designs.Trial registrationCurrent controlled trials ISRCTN68572159