Binkiewicz Przemysław, Michaluk Krzysztof, Demiańczyk Aleksandra
Oddział Ginekologiczno-Połozniczy Szpitala Powiatowego w Pyskowicach.
Ginekol Pol. 2010 Nov;81(11):834-9.
Lady-Comp, Baby-Comp and Pearly cycle computers are medical devices that use sophisticated statistical gathering methods, as well as a comprehensive database, to precisely determine fertile and infertile phases of a menstrual cycle on the basis of everyday basal body temperature measurements. They have been produced and distributed worldwide by Valley Electronics GmbH (Eschenlohe, Bavaria, Germany) for over 25 years.
The aim of the study was to calculate the Pearl Index of cycle computers in order to determine their contraceptive effectiveness.
510 Polish women, randomly chosen from the database of the distributor, who had been using the device for over one year or during 13 menstrual cycles, received the questionnaire. The Pearl Index was calculated as a quotient of the number of unplanned pregnancies and the total number of cycles during which cycle computers were used and the obtained value was then multiplied by 1300. Statistical methods were applied to analyze data from the questionnaires and to calculate the Pearl Index. Unplanned pregnancy odds ratio for women using additionally condoms during the fertile phase of the cycle was also calculated.
139 properly filled questionnaires were the source of data about 3332 cycles. After the initial analysis, 290 cycles were declined because the respondents had not complied with the computer indications and 1021 cycles were declined because the respondents had been using other contraceptive methods at the same time--no unplanned pregnancy was noted in that group. In the investigated group of 2040 cycles of correct cycle computers use, one unplanned pregnancy was observed. Calculated Pearl Index for this group amounted to 0.64; it means, that less than 7 out of 1000 users of cycle computer as a contraceptive method may become pregnant within one year The odds of pregnancy in women using a cycle computer and condoms on fertile days amounted to 1.035%; it means that 1 out of 100 users of the combined methods may become pregnant within one year.
The Pearl Index value of cycle computers is comparable with the Pearl Index of hormonal contraceptives. Cycle computers offer an effective and drug-free method of contraception to all women who wish to limit interventions in their bodily functions and do not want or cannot use other contraceptive methods.
Lady-Comp、Baby-Comp和Pearly周期计算器是医疗设备，它们运用复杂的统计收集方法以及一个综合数据库，依据日常基础体温测量精确确定月经周期的易孕期和非易孕期。25多年来，它们一直由德国巴伐利亚州埃申洛厄的Valley Electronics GmbH公司生产并在全球销售。
本研究旨在计算周期计算器的Pearl指数，以确定其避孕效果。
从经销商数据库中随机选取510名波兰女性，她们使用该设备已超过一年或经历了13个月经周期，向她们发放了问卷。Pearl指数的计算方法是意外怀孕数除以使用周期计算器的周期总数，所得值再乘以1300。运用统计方法分析问卷数据并计算Pearl指数。还计算了在周期易孕期额外使用避孕套的女性意外怀孕的比值比。
139份填写正确的问卷是3332个周期数据的来源。初步分析后，290个周期被排除，因为受访者未遵循计算器的指示；1021个周期被排除，因为受访者同时使用了其他避孕方法——该组未发现意外怀孕情况。在调查的2040个正确使用周期计算器的周期组中，观察到1例意外怀孕。该组计算出的Pearl指数为0.64；这意味着，作为避孕方法，每1000名使用周期计算器的用户中，一年内怀孕的不到7人。在易孕期使用周期计算器和避孕套的女性怀孕几率为1.035%；这意味着，使用联合方法的用户中，每100人中有1人可能在一年内怀孕。
周期计算器的Pearl指数值与激素避孕药的Pearl指数相当。周期计算器为所有希望减少对身体功能干预且不想或不能使用其他避孕方法的女性提供了一种有效且无药物的避孕方法。
