Fig. 1
From: Estimating a population cumulative incidence under calendar time trends
Lexis diagram showing individuals entering the study in the period between O and P with end of follow-up given by D. The individuals are grouped into six strata (B) by their time of entry with t 1,…,t 6 denoting the common end of follow-up age for each stratum. The grey, hatched area denotes the data that we need to drop to get rid of administrative censoring within each stratum. The resulting data available before age t is the red, hatched area