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Table 3 Numbers of participants with complete data for various time-varying covariates

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

Phase N participating N not retired Employment grade recorded Marital status recorded Housing tenure recorded SF36 recorded Long-standing illness recorded
1 10308 N/A 10308 10270 10226 N/A 7654
2 8132 N/A 8110 8124 8095 N/A 8129
3 8815 N/A 8312 8306 8307 8292 8634
4 8628 7021 5386 7801 N/A 7669 8564
5 7870 5625 3525 6921 N/A 6927 7250
6 7355 4543 2595 6665 N/A 6601 7345