Estimating HIV Incidence during Pregnancy and Knowledge of Prevention of Mother-to-Child Transmission with an Ad Hoc Analysis of Potential Cofactors

Table 3

Incidence of HIV seroconversion in the seven healthcare facilities.

Number of participants	Time span between 1st and 2nd test (months)	Number of participants who seroconverted	Percentage of participants who seroconverted	Woman-years follow-up
262	3.0	8.0	3.1	65.5
123	4.0	1.0	0.81	41.0
63	5.0	1.0	1.59	26.25
29	6.0	0.0	0.00	14.5
Total = 477				147.25

Incidence of HIV seroconversion: 2.1% (147.25 woman-years).
Incidence rate of HIV seroconversion: 6.8/100 woman-years.