Contraceptive efficacy, safety, fit, and acceptability of a single-size diaphragm developed with end-user input.

Objective: To estimate contraceptive efficacy, safety, acceptability, and fit of a single-size diaphragm used with contraceptive gel.

Methods: We conducted a multicenter trial in which 450 couples used the single-size diaphragm, 300 randomized to acid-buffering gel and 150 to nonoxynol-9, for at least 190 days and six menstrual cycles. Visits were at enrollment and after menstrual cycles 1, 3, and 6.

Participant characteristics associated with withdrawal from a large randomized trial of spermicide effectiveness.

Background: In most recent large efficacy trials of barrier contraceptive methods, a high proportion of participants withdrew before the intended end of follow-up. The objective of this analysis was to explore characteristics of participants who failed to complete seven months of planned participation in a trial of spermicide efficacy.

Methods: Trial participants were expected to use the assigned spermicide for contraception for 7 months or until pregnancy occurred.