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Table 2 Potential predictors of attrition variables

From: Predictors of two forms of attrition in a longitudinal health study involving ageing participants: An analysis based on the Whitehall II study

Potential predictors of attrition variables When obtained from self-completed questionnaires Response rate
Age (years) Phase 1 (1985–1988) 10,308
Gender Phase 1 ( 1985-1988 10,308
Marital status (Married/not married) Phase 1 ( 1985-1988 10,308
Occupational grade (3 levels) Phase 1 ( 1985-1988 10,308
Educational achievement (5 levels) Phase 5 (1997–1999) 7,870
Retirement At various phases  
Housing (owned/rented) Phase 1 ( 1985-1988 10,308
Number of social activities Phase 5 (1997–1999) 7,870
SF 36 (mental health & physical function) Phase 5 (1997–1999) 7,870
Longstanding illness (self-reported yes/no) Phase 1 ( 1985–1988) only asked of 6339 participants 10,308