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\begin{document}

\title{Predictors of fertility awareness-based method use among women trying to
conceive and women contemplating pregnancy: a prospective cohort study.}



\author[1]{Melissa Perez Capotosto}%
\author[1]{Christopher  Lee }%
\author[1]{Corrine Jurgens}%
\author[2]{Siwen Wang }%
\author[3]{Makiko Mitsunami}%
\author[4]{Brittany Charlton}%
\author[4]{Jorge Chavarro}%
\affil[1]{Boston College}%
\affil[2]{Harvard University T H Chan School of Public Health}%
\affil[3]{Affiliation not available}%
\affil[4]{Harvard School of Public Health}%


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  \date{May 25, 2024}


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\begin{abstract}
Objective: To identify predictors of fertility awareness-based method
use. Design: Ongoing, prospective internet-based cohort study. Setting:
Nurses living in the United States and Canada. Population: Women trying
to become pregnant or contemplating pregnancy. Methods: Multivariable
negative binomial regression. Main Outcome Measures: Fertility
awareness-based methods. Results: Among the 23,418 women with pregnancy
intention, 955 were trying to conceive and 2,282 were contemplating
pregnancy. The ongoing duration of pregnancy attempt and gravidity were
associated with the number of fertility awareness-based methods used
among women actively trying to conceive. Compared to women who had been
trying for two months or less, the number of methods was 29\% (95\% CI,
1.11---1.51), 45\% (95\% CI, 1.27---1.66) and 38\% (95\% CI,
1.21---1.58) higher for women who had been trying for 3-5 months, 6-12
months, or more than 1 year, respectively. Compared to nulligravid
women, the number of fertility-awareness based methods was 17\% (95\%
CI, 0.70---0.98) lower for women with a history of two or more
pregnancies. Among women contemplating pregnancy, those who were married
or in a domestic partnership used on average 39\% (95\% CI, 1.23---1.57)
more fertility awareness-based methods than unpartnered women.
Conclusion(s): Duration of ongoing pregnancy attempt and gravidity were
the only significant predictors for number of fertility awareness-based
method use among women trying to conceive, whereas partnership was the
only significant predictor among women contemplating pregnancy.Funding:
Supported by grants R24ES028521 and U01HL145386 from the National
Institutes of Health. Keywords: pre-conception, pregnancy planning,
fertility awareness-based methods.%
\end{abstract}%



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