Accuracy of Reporting of Menstrual Cycle Length
Open Access
- 15 November 2007
- journal article
- research article
- Published by Oxford University Press (OUP) in American Journal of Epidemiology
- Vol. 167 (1), 25-33
- https://doi.org/10.1093/aje/kwm265
Abstract
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.Keywords
This publication has 17 references indexed in Scilit:
- Validity of Self-Reported Menstrual Cycle LengthAnnals of Epidemiology, 2007
- Menstruation in Girls and Adolescents: Using the Menstrual Cycle as a Vital SignPublished by American Academy of Pediatrics (AAP) ,2006
- Relation of Cardiovascular Risk Factors in Women Approaching Menopause to Menstrual Cycle Characteristics and Reproductive Hormones in the Follicular and Luteal PhasesJournal of Clinical Endocrinology & Metabolism, 2006
- Menstrual Cycle Characteristics and Incidence of Premenopausal Breast CancerCancer Epidemiology, Biomarkers & Prevention, 2005
- Postmenopausal Breast Cancer Risk and Cumulative Number of Menstrual CyclesCancer Epidemiology, Biomarkers & Prevention, 2005
- Polychlorinated Biphenyls and Menstrual Cycle CharacteristicsEpidemiology, 2005
- How regular is regular? An analysis of menstrual cycle regularityContraception, 2004
- Chlorination by-products in drinking water and menstrual cycle function.Environmental Health Perspectives, 2003
- Serum dioxin concentrations and menstrual cycle characteristics.American Journal of Epidemiology, 2002
- Retrospective self-report compared with menstrual diary data prospectively kept during the menopausal transitionClimacteric, 2000