Open AccessScreening for depression and anxiety: correlates of non‐response and cohort attrition in the Netherlands Study of Depression and Anxiety (NESDA)
Author(s) -
Van Der Veen Willem Jan,
Van Der Meer Klaas,
Penninx Brenda W.
Publication year - 2009
Publication title -
international journal of methods in psychiatric research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.275
H-Index - 73
eISSN - 1557-0657
pISSN - 1049-8931
DOI - 10.1002/mpr.297
Subject(s) - anxiety , psychopathology , attrition , depression (economics) , cohort , cohort study , population , psychology , clinical psychology , mental health , logistic regression , psychiatry , medicine , environmental health , dentistry , economics , macroeconomics
Abstract A major problem in the analysis of attrition of cohorts in studies on mental health problems is that data on those who do not participate at the outset of a study are largely unavailable. It is not known how underlying psychopathology affects the first stages of screening where non‐response and selectivity are usually highest. This article presents results of one of the centres of the Netherlands Study of Depression and Anxiety (NESDA), a longitudinal study aimed at describing the long‐term course and consequences of depression and anxiety disorders. The aim is to describe the different ways of attrition during the first NESDA‐wave in a cohort of patients aged 18–65 years of the Registration Network Groningen and to analyse whether attrition is related to gender, age and psychopathology as recorded in general practice. The attrition of the study cohort ( n = 8475) was highest during the first stages, eventually leading to a population of 169 patients only who participated in the full NESDA‐programme. Probabilities of transition from one stage of the screening process to the next were regressed on selected background variables using binary logistic regression. Correlates of participation were being female and being older (>40). Psychopathology was an important variable in the formation of the initial sample cohort, but only had a weak influence on patient response to the screening questionnaire. Study design factors had a stronger impact on the changing composition of the cohort at each screening stage compared to patient factors. Copyright © 2009 John Wiley & Sons, Ltd.