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Reliability of retrospectively assessed categorical menstrual cycle length data.

Authors
Bachand-AM; Cragin-LA; Reif-JS
Source
Ann Epidemiol 2009 Jul; 19(7):501-503
NIOSHTIC No.
20035882
Abstract
PURPOSE: Prospective diaries have been shown to be more reliable than retrospective questionnaires for the assessment of menstrual cycle length collected as continuous data. We investigated the reliability of retrospectively collected categorical cycle length data. METHODS: In 2005, 67 women from Illinois and Vermont completed a menstrual diary and retrospective questionnaire. Based on commonly used cutpoints for normal cycle length, we created 2-, 3- and 4-category cycle length variables, calculated percent agreement, Cohen's kappa and prevalence index and investigated factors associated with accurate reporting. RESULTS: Overall agreement between diary and questionnaire responses was highest for the 2-category cycle length variable, <=35 vs. > 35 days (93%), and the 3-category variable, <25, 25-35 and > 35 days (82%). While Cohen's kappa fell below 0.6, its magnitude was limited by a high prevalence of "normal"" cycle length. Women with regular cycles were slightly more likely to have concordant responses. CONCLUSIONS: In epidemiologic studies where cycle length categories are of interest, the limitations of prospective diaries in terms of cost, compliance, attrition and power must be carefully weighed against the potentially decreased reliability of questionnaire data.
Keywords
Epidemiology; Menstrual-disorders; Questionnaires; Questionnaires; Statistical-analysis; Women; Author Keywords: Reliability (Epidemiology); Menstrual Cycle; Questionnaires; Research Design
Contact
Annette M. Bachand, Colorado State University, Department of Environmental and Radiological Health Sciences, 1681 Campus Delivery, Fort Collins, CO 80523-1681
CODEN
ANNPE3
Publication Date
20090701
Document Type
Journal Article
Email Address
annette.bachand@colostate.edu
Funding Type
Cooperative Agreement; Agriculture
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Identifying No.
Cooperative-Agreement-Number-U50-OH-008085
Issue of Publication
7
ISSN
1047-2797
Priority Area
Agriculture, Forestry and Fishing
Source Name
Annals of Epidemiology
State
CO
Performing Organization
Colorado State University - Ft. Collins
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