Cox proportional hazard analysis of baseline and time-dependent factors associated with pregnancy after ART initiation (N = 117a).

*Variables preceded by an asterisk are baseline values; all others are time-dependent variables updated to the time nearest the date of conception.aThree women without baseline values were excluded from this analysis.bCombining single, divorced, separated & widowed.cWomen who reported no sexual activity were not asked about condom use, resulting in a missing value. This significance thus merely reflects the association between sexual activity and pregnancy. This ‘missing’ category was created to account for the fact that 28 (24%) of 117 women with a first incident pregnancy had a routine follow-up interview that did not cover the period of conception (i.e. fell outside the 30 to 90 days period following their last menstrual period).