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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