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Table 1 Notation table for estimation of event proportions

From: Interim analysis for binary outcome trials with a long fixed follow-up time and repeated outcome assessments at pre-specified times

Visit number J Visit time t j Subjects at risk m j New events e j Incidence at visit j d j
0 t 0 (<6 m) m 0 e0 = 0 d0 = 0
1 t 1 (6 m) m 1 e 1 d1 = e1/m1
2 t 2 (12 m) m 2 e 2 d2 = e2/m2
3 t 3 (18 m) m 3 e 3 d3 = e3/m3
4 t 4 (24 m) m 4 e 4 d4 = e4/m4