Table 1 Proportional hazards analysis of the abandonment data.

Estimated date coefficient of 1.660 is strongly negative, indicating decreased abandonment as study progressed.

EstimateSEZ valueP valueBootstrap
SE
Distance0.2100.0722.9020.0040.068
Date–1.6600.107–15.5080.0000.088
Age–0.1540.084–1.8340.0670.082
Sex–0.0270.076–0.3470.7290.078
ALL0.1460.0821.7710.0770.083
AML–0.0700.081–0.8640.3870.088