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Effect of prospectively measured pregnancy intentions on the consistency of contraceptive use among young women in Michigan.
Hum Reprod. 2013 Mar; 28(3):642-50.HR

Abstract

STUDY QUESTION

What is the predictive value of pregnancy intentions on contraceptive behaviours among women aged 18-19?

SUMMARY ANSWER

Women aged 18-19 have high levels of inconsistent use of contraception, which mostly occur at times when women strongly wish to avoid a pregnancy.

WHAT IS KNOWN ALREADY

Pregnancy intentions provide an indication of how well individuals achieve their reproductive goals. However, retrospective accounts of pregnancy intentions using dichotomous indicators suffer temporal instability and fail to capture the wide range of attitudes towards pregnancy.

STUDY DESIGN, SIZE, DURATION

In this study, data are drawn from a population-based survey of 992 women of ages 18-19 years in Michigan, who completed weekly journals assessing contraceptive use, pregnancy intentions and reproductive outcomes during 2.5 years of follow-up. The response rate was 86% for the baseline interview and 65% after 2.5 years of follow-up.

PARTICIPANTS/MATERIALS, SETTING, METHODS

We examined 15 446 pairs of journal entries. We used logistic regression with random effects to assess the predictive effect of women's desire to become pregnant and to avoid a pregnancy, measured each week, on consistency of use of contraception the following week.

MAIN RESULTS AND THE ROLE OF CHANCE

Women reported inconsistent use of contraception in more than a quarter of weekly journals (28.3%). Consistent use of contraception increased from 22 to 78% as women s intentions to become pregnant decreased and increased from 23 to 78% as motivations to avoid pregnancy increased. The combination of scores of the pregnancy desire and avoidance scales shows indifferent or ambivalent pregnancy attitudes in 8.6% of weekly records. These women were more likely to report inconsistent contraceptive use compared with women who expressed anti-conception attitudes [OR = 2.8 (2.2-3.5)]. However, 23% of women who had unequivocal anti-conception feelings did not use contraception consistently, contributing to 72% of the weeks of inconsistent use in our population.

LIMITATIONS, REASONS FOR CAUTION

In this study, consistency of contraceptive use, based on the use of contraception at every act of intercourse, does not fully capture a women's risk of becoming pregnant. The 35% attrition after 2.5 years may have affected the internal validity of our results, although a reanalysis based on the first year of observation produced very similar results.

WIDER IMPLICATIONS OF THE FINDINGS

Because most instances of inconsistent use of contraception occur among women who are keen to avoid a pregnancy, our results suggest there is room for improving contraceptive behaviours by promoting use of methods which do not require user adherence.

STUDY FUNDING/COMPETING INTEREST(S)

This work was supported by the National Institute of Child Health and Human Development for grant #R01-HDHD050329 (P.I. Barber, University of Michigan) and grant #R24HD047879 (Center infrastructure of the Office of Population Research at Princeton University, JT and KSH). None of the authors have a competing interest.

Authors+Show Affiliations

Department of Population, Family and Reproductive Health, Johns Hopkins Bloomberg School of Public Health, 615 North Wolfe Street, Baltimore, MD 21205, USA. cmoreau@jhsph.eduNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, N.I.H., Extramural

Language

eng

PubMed ID

23241838

Citation

Moreau, C, et al. "Effect of Prospectively Measured Pregnancy Intentions On the Consistency of Contraceptive Use Among Young Women in Michigan." Human Reproduction (Oxford, England), vol. 28, no. 3, 2013, pp. 642-50.
Moreau C, Hall K, Trussell J, et al. Effect of prospectively measured pregnancy intentions on the consistency of contraceptive use among young women in Michigan. Hum Reprod. 2013;28(3):642-50.
Moreau, C., Hall, K., Trussell, J., & Barber, J. (2013). Effect of prospectively measured pregnancy intentions on the consistency of contraceptive use among young women in Michigan. Human Reproduction (Oxford, England), 28(3), 642-50. https://doi.org/10.1093/humrep/des421
Moreau C, et al. Effect of Prospectively Measured Pregnancy Intentions On the Consistency of Contraceptive Use Among Young Women in Michigan. Hum Reprod. 2013;28(3):642-50. PubMed PMID: 23241838.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of prospectively measured pregnancy intentions on the consistency of contraceptive use among young women in Michigan. AU - Moreau,C, AU - Hall,K, AU - Trussell,J, AU - Barber,J, Y1 - 2012/12/13/ PY - 2012/12/18/entrez PY - 2012/12/18/pubmed PY - 2013/8/24/medline SP - 642 EP - 50 JF - Human reproduction (Oxford, England) JO - Hum. Reprod. VL - 28 IS - 3 N2 - STUDY QUESTION: What is the predictive value of pregnancy intentions on contraceptive behaviours among women aged 18-19? SUMMARY ANSWER: Women aged 18-19 have high levels of inconsistent use of contraception, which mostly occur at times when women strongly wish to avoid a pregnancy. WHAT IS KNOWN ALREADY: Pregnancy intentions provide an indication of how well individuals achieve their reproductive goals. However, retrospective accounts of pregnancy intentions using dichotomous indicators suffer temporal instability and fail to capture the wide range of attitudes towards pregnancy. STUDY DESIGN, SIZE, DURATION: In this study, data are drawn from a population-based survey of 992 women of ages 18-19 years in Michigan, who completed weekly journals assessing contraceptive use, pregnancy intentions and reproductive outcomes during 2.5 years of follow-up. The response rate was 86% for the baseline interview and 65% after 2.5 years of follow-up. PARTICIPANTS/MATERIALS, SETTING, METHODS: We examined 15 446 pairs of journal entries. We used logistic regression with random effects to assess the predictive effect of women's desire to become pregnant and to avoid a pregnancy, measured each week, on consistency of use of contraception the following week. MAIN RESULTS AND THE ROLE OF CHANCE: Women reported inconsistent use of contraception in more than a quarter of weekly journals (28.3%). Consistent use of contraception increased from 22 to 78% as women s intentions to become pregnant decreased and increased from 23 to 78% as motivations to avoid pregnancy increased. The combination of scores of the pregnancy desire and avoidance scales shows indifferent or ambivalent pregnancy attitudes in 8.6% of weekly records. These women were more likely to report inconsistent contraceptive use compared with women who expressed anti-conception attitudes [OR = 2.8 (2.2-3.5)]. However, 23% of women who had unequivocal anti-conception feelings did not use contraception consistently, contributing to 72% of the weeks of inconsistent use in our population. LIMITATIONS, REASONS FOR CAUTION: In this study, consistency of contraceptive use, based on the use of contraception at every act of intercourse, does not fully capture a women's risk of becoming pregnant. The 35% attrition after 2.5 years may have affected the internal validity of our results, although a reanalysis based on the first year of observation produced very similar results. WIDER IMPLICATIONS OF THE FINDINGS: Because most instances of inconsistent use of contraception occur among women who are keen to avoid a pregnancy, our results suggest there is room for improving contraceptive behaviours by promoting use of methods which do not require user adherence. STUDY FUNDING/COMPETING INTEREST(S): This work was supported by the National Institute of Child Health and Human Development for grant #R01-HDHD050329 (P.I. Barber, University of Michigan) and grant #R24HD047879 (Center infrastructure of the Office of Population Research at Princeton University, JT and KSH). None of the authors have a competing interest. SN - 1460-2350 UR - https://www.unboundmedicine.com/medline/citation/23241838/Effect_of_prospectively_measured_pregnancy_intentions_on_the_consistency_of_contraceptive_use_among_young_women_in_Michigan_ L2 - https://academic.oup.com/humrep/article-lookup/doi/10.1093/humrep/des421 DB - PRIME DP - Unbound Medicine ER -