1Based on Stirnemann et al. (2013) 3. Table S2 Validities of Several Forward Count and Backward Count Windows Represented in the Literature Conception Probability In Fertile Window Forward Count Day 6-14 .429 .437 Backward Counts RC Day 14-21 known .654 .660 – RC Day 14-28 known .421 .424 – RC Day 13-19 .643 .633 – RC Day 14-21 report .7 .504 .504 – RC Day 14-28 report .7 .341 .346 – RC Day 13-19 report .7 .475 .462 – RC Day 14-21 report .5 .458 .457 – RC Day 14-28 report .5 .321 .325 – RC Day 13-19 report .5 .430 .420 – N = 56,345. Conception Probability, In Fertile Window: two criterion measures. Forward Count: days counted from beginning of cycle. Backward Count: days counted from end of cycle. RC Day: reverse count days days counted backward from first day of next menses. Hence, RC day 1 is – the first day prior to onset of next menstrual bleeding, RC day 2 is the second day prior to the onset of next menstrual cycle, etc. Known, report .7, report .5: validity when day of onset of next menses is confirmed, validity when day of onset of next menses is estimated from typical cycle length, where validity of report is .7, validity when day of onset of next menses is estimated from typical cycle length, where validity of report is .5, respectively.
1Based on Stirnemann et al. (2013) 3. Table S2 Validities of Several Forward Count and Backward Count Windows Represented in the Literature Conception Probability In Fertile Window Forward Count Day 6-14 .429 .437 Backward Counts RC Day 14-21 – known .654 .660 RC Day 14-28 – known .421 .424 RC Day 13-19 – .643 .633 RC Day 14-21 – report .7 .504 .504 RC Day 14-28 – report .7 .341 .346 RC Day 13-19 – report .7 .475 .462 RC Day 14-21 – report .5 .458 .457 RC Day 14-28 – report .5 .321 .325 RC Day 13-19 – report .5 .430 .420 N = 56,345. Conception Probability, In Fertile Window: two criterion measures. Forward Count: days counted from beginning of cycle. Backward Count: days counted from end of cycle. RC Day: reverse count days – days counted backward from first day of next menses. Hence, RC day 1 is the first day prior to onset of next menstrual bleeding, RC day 2 is the second day prior to the onset of next menstrual cycle, etc. Known, report .7, report .5: validity when day of onset of next menses is confirmed, validity when day of onset of next menses is estimated from typical cycle length, where validity of report is .7, validity when day of onset of next menses is estimated from typical cycle length, where validity of report is .5, respectively.
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