Variation in post-sampling mortality: adjusted odds ratios of post-sampling mortality after initial inclusion in the sampling frame, by socio-demographic characteristic and cancer diagnosis. (p < 0.0001 for age and cancer diagnosis, p = 0.0047 for sex, p = 0.45 for ethnicity, p = 0.0002 for deprivation; estimates from multivariable regression, adjusted for all variables shown).