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. Author manuscript; available in PMC: 2018 Dec 1.
Published in final edited form as: Contraception. 2017 Sep 4;96(6):420–425. doi: 10.1016/j.contraception.2017.08.014

Figure 1. Flow chart describing how pregnancies were detected in the study.

Figure 1

Each box showing an “end-state” also contains the number n of women who are found in this state. Red and green boxes contain the women who are considered Pregnant and Not Pregnant in all calculations of the study. The yellow “Unknown”-box is considered Not Pregnant for the main calculations, but Pregnant for the worst case-scenario. There were 25 additional pregnancies, detected in any of the three channels illustrated in the figure. These pregnancies, as well as the full exposure of the pregnant women, were removed from the study due to the users’ follow-up statement that the pregnancy was planned.