Accuracy of reporting of menstrual cycle length
Accuracy of reporting of menstrual cycle length
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DOI：
10.1093/aje/kwm265
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发表时间：
2008-01-01
影响因子：
5
通讯作者：
Baird, Donna D.
中科院分区：
文献类型：
--
作者：
Jukic, Anne Marie Zaura;Weinberg, Clarice R.;Baird, Donna D.
有许多基于自我报告的月经周期长度的研究，但对这种测量的有效性知之甚少。作者使用了1990年从352名出生于伊利诺伊州芝加哥的37-39岁妇女中收集的数据。女性在研究入组时报告其通常的周期长度以及行为和生殖特征，然后完成长达6个月的每日月经日记。作者使用kappa系数比较了观察到的周期长度（几何平均值）与报告的长度。为了评估系统效应，他们对报告和观察到的周期长度之间的差异进行了线性回归。观察到的和报告的周期长度之间的一致性为中等。粗总体kappa系数为0.33;针对女性内采样变异性调整的kappa为0.45（95%置信区间：0.36，0.55）。平均而言，女性高估了自己的周期长度0.7天（95%置信区间：0.3，1.0）。性活跃妇女和有不孕症史妇女的报告更准确。产次、体重指数、既往对不规则月经周期的医学评估和运动都与系统性报告差异相关。依赖于自我报告的周期长度的研究可能容易出现人为的发现，因为系统的协变量对报告的影响。
There are many studies based on self-reported menstrual cycle length, yet little is known about the validity of this measure. The authors used data collected in 1990 from 352 women born in Chicago, Illinois, aged 37-39 years. Women reported their usual cycle length and behavioral and reproductive characteristics at study enrollment and then completed daily menstrual diaries for up to 6 months. The authors compared this observed cycle length (geometric mean) with the reported length by using kappa coefficients. To assess systematic effects, they performed linear regression of the difference between reported and observed cycle length. Agreement between observed and reported cycle length was moderate. The crude overall kappa coefficient was 0.33; the kappa adjusted for within-woman sampling variability was 0.45 (95% confidence interval: 0.36, 0.55). On average, women overestimated their cycle length by 0.7 days (95% confidence interval: 0.3, 1.0). Reporting by sexually active women and women with a history of infertility was more accurate. Parity, body mass index, prior medical evaluation for irregular cycles, and exercise were all associated with systematic reporting differences. Studies that rely on self-reported cycle length could be prone to artifactual findings because of systematic covariate effects on reporting.