Hall KS, White KO, Reame N, Westhoff C. Studying the use of oral contraception: a review of measurement approaches.
J Womens Health (Larchmt) 2010;
19:2203-10. [PMID:
21034277 PMCID:
PMC2990281 DOI:
10.1089/jwh.2010.1963]
[Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND
Although oral contraception (OC) misuse is presumed to play an important role in unwanted pregnancy, research findings have often been equivocal, perhaps reflecting unaddressed inconsistencies in methodological approaches.
METHODS
Using established databases, we performed a systematic review of measurement methods for OC use using primary research reports published from January 1965 to December 2009.
RESULTS
Terminology used to describe OC use, which included "continuation," "compliance," and "adherence," differed across studies and was rarely defined. The majority of studies (n = 27 of 38, 71%) relied solely on self-report measures of OC use. Only two reports described survey or interview questions, and reliability and validity data were seldom described. More rigorous measurement methods, such as pill counts (electronic or manual), serum and urinary biomarkers, and pharmacy records, were infrequently employed. Nineteen studies simultaneously used more than one method, but only three studies compared direct and indirect methods.
CONCLUSIONS
The lack of a consistent, well-defined measurement of OC use limits our understanding of contraceptive misuse and related negative outcomes. Future research should clarify terminology, develop standardized measures, incorporate multimethod approaches with innovative methods, and publish details of measurement methods.
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