Mu Qiyan, Fehring Richard J
Qiyan Mu is a nursing PhD student and graduate research assistant, Marquette University, Milwaukee, WI. The author can be reached via e-mail at
MCN Am J Matern Child Nurs. 2014 Jan-Feb;39(1):35-40. doi: 10.1097/NMC.0b013e3182a76b88.
To compare pregnancy rates when women have intercourse on self-estimated high and peak fertile days and when they only have intercourse on low fertile days during the fertile window (FW).
We used a prospective observational cohort study design. Our convenience sample included 124 women who utilized our online charting Web sites to achieve pregnancy from January 2010 to November 2012. Participants used an electronic hormonal fertility monitor (EHFM) or self-observed cervical mucus or both to determine fertility during the estimated FW. Pregnancy rates were determined with Kaplan-Meier survival analysis. Chi square analysis was used to evaluate the efficacy of achieving pregnancy between two different intercourse patterns.
The pregnancy rate was 87 per 100 women at 12 months when intercourse happened on high or peak days and 5 per 100 when intercourse occurred only on low days of the FW. Chi square analysis showed a greater proportion of pregnancies with intercourse on high and peak fertile days of the menstrual cycle (x2 = 40.2, p < .001, df = 1).
Focusing intercourse on high or peak fertile days during the estimated FW enhances the probability of achieving a desired pregnancy. Fertility awareness-based online charting system is effective in helping women to determine their FW and target intercourse accordingly to achieve pregnancy.
比较女性在自我估算的高生育力日和峰值生育力日进行性交时的妊娠率，以及她们在生育窗口（FW）期间仅在低生育力日进行性交时的妊娠率。
我们采用前瞻性观察性队列研究设计。我们的便利样本包括124名女性，她们在2010年1月至2012年11月期间利用我们的在线图表网站来实现怀孕。参与者使用电子激素生育监测器（EHFM）或自我观察宫颈黏液或两者结合来确定估算的FW期间的生育力。妊娠率通过Kaplan-Meier生存分析确定。卡方分析用于评估两种不同性交模式之间实现怀孕的效果。
在高生育力日或峰值生育力日进行性交时，每100名女性在12个月时的妊娠率为87%，而仅在FW的低生育力日进行性交时为每100名5%。卡方分析显示，在月经周期的高生育力日和峰值生育力日进行性交时怀孕的比例更高（x2 = 40.2，p < .001，自由度 = 1）。
在估算的FW期间将性交集中在高生育力日或峰值生育力日可提高实现预期怀孕的概率。基于生育力意识的在线图表系统可有效帮助女性确定其FW并相应地将性交作为目标以实现怀孕。
