累积计算法测定双相基础体温对排卵日的评估

用基础体温BBT和B超监测排卵对72名月经周期正常妇女的100个月经周期预测排卵。其中48个周期做了LH峰值测定。以累积统计法微机测定BBT升高的第一天(估计排卵日);用B超监测卵泡破裂作为排卵日(D-O)。比较BBT升高的第一天与D-O的关系:结果表明BBT升高第一日波动在D-1到D+3范围内占83%周期。如在BBT升高后的5天作为避孕期,则避孕可靠性复盖了83%周期。如对需用BBT作指导避孕的对象进行选择,累积分析法的可靠性更会提高。

An Evaluation of Using Cumulative Sum Test Method to Basal BodyTemperature Charts in Detecting Ovulation

Prediction of ovulation was carried out by basal body temperature (BBT) charts and B-ultrasonography in 72 normally menstruation women for a total of 100 cycles each. LH peak values were also determined in 48 cycles.The first day of the BBT rise corre- lated well with the estimated time of ovulation were identified by computer using a cumulative sum (Cusum) test. Ovarian scanning by ultrasound is now recognized as a reliable method of detecting ovulation. Thus we employed the ultrasound image of follicle rupture as a sign of ovulation. The relation between BBT rise and ovulation were as follow: The result of Cusum analysis by computer of 100 BBT charts showed that the BBT rise ranged frmo D-1 through D+3 in 83% of cycles.The authors suggested that the risk of conception through intercourse afterthe 5th day of elevated temperature is very low. This result might be widely applied to natural family planning. If we chose the subjects considerably,the method of Cusum analysis might be much more reliable.