Table 1. The numbers of independent BED tests provided by the 353 women who seroconverted during follow-up in the ZVITAMBO Trial, when either no exclusion criteria were applied, or where case were excluded if either there was only s = 1 sample per case, or the maximum time (t ^max) between the last negative and first positive HIV tests was greater than 120 days.

	Inclusion criterion
BED samples per case	All	tmax ≤120 days s>1
1	167	–
2	89	28
3	35	25
4	21	17
5	24	17
6	8	5
7	8	7
8	1	1
Total	353	100