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. Author manuscript; available in PMC: 2014 May 13.
Published in final edited form as: Contraception. 2014 Jan 24;89(5):451–459. doi: 10.1016/j.contraception.2013.10.019

Table 4.

Average duration of UP

Health state Weight* Duration
in months		 Comment
Live birth 0.485 10.23 Assumption: 9.23 months of pregnancy based on an average gestation period of 40 weeks LESS 1 month before realizing UP PLUS 2 months off contraception [29].
Induced abortion 0.373 2.08 Assumption: Induced abortions are conducted within first 12 weeks of pregnancy [31] LESS 1 month before realizing UP.
Spontaneous abortion 0.137 3.62 Assumption: Spontaneous abortions occur within 20 weeks of pregnancy [32] LESS 1 month before realizing UP.
Ectopic pregnancy 0.005 1.50 Assumption: Ectopic pregnancies are detected within 7 to 8 weeks of pregnancy LESS 1 month before realizing UP.
Weighted average duration of UP 6.24
*

weights to determine age-specific probability of each outcome taken from published literature [14, 24].