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. 2015 Mar 20;10(3):e0121950. doi: 10.1371/journal.pone.0121950

Table 1. Formal definitions for different response classes.

Attrition
Name Definition
Explicit Withdrawals Actively withdrew from the study at any time following Time 1.
Lost Respondents Has not responded following Time 1, but not explicitly withdrawn

Notes: These response classes refer only to response patterns over the first 4 waves (Time 1—Time 4) of the NZAVS. The Explicit Withdrawals response class excludes withdrawals due to death.