Yasamin Kusunoki

Contraceptive Method Choice Among Youth in the United States: The Importance of Relationship Context

We examine the relationship characteristics associated with contraceptive method choice within young people’s nonmarital sexual relationships, using data from retrospective relationship histories available in the third wave (2001–2002) of the National Longitudinal Study of Adolescent Health. Data-reduction techniques produce a detailed multidimensional characterization of relationship commitment for nonmarital sexual relationships. We then use multilevel analysis to estimate associations between two key relationship characteristics—relationship commitment and couple heterogamy—and the type of contraceptive method used at last sexual intercourse within each relationship. Results indicate that for a given individual, contraceptive method choice varies across relationships as a function of these characteristics, even after we account for important individual and family characteristics and prior relationship experiences.

Health insurance coverage, health care-seeking behaviors, and genital chlamydial infection prevalence in sexually active young adults

Background: Genital chlamydial infection remains prevalent in young adults. Differential access to health care and thus the opportunity for testing, treatment, sexual partner services, and risk reduction counseling may be among the factors contributing to variation in chlamydial prevalence. Goal: We investigated associations of health insurance coverage and health care-seeking behaviors, both indicators of healthcare access, to chlamydial infection in a nationally representative sample of young adults. Methods: Weighted logistic regression techniques were used to examine associations between indicators of healthcare access and chlamydial infection as determined using Chlamydia trachomatis ligase chain reaction among a subset of sexually active young adults ages 18 to 27 interviewed at wave III of the National Longitudinal Study of Adolescent Health (N = 9347). Analyses were stratified by gender and controlled for age and race/ethnicity. Results: Having continuous health insurance coverage in the preceding 12 months was associated with a lower risk of chlamydial infection in both men and women. Usual site of health care was also associated with chlamydial infection. Men who reported emergency rooms as their usual site of care had a higher risk of infection, whereas women who used school clinics had a lower risk compared with those seen in primary care settings. Having seen a provider in the preceding 12 months was associated with a lower risk of chlamydial infection for men only. These associations remained even after adjusting for racial/ethnic differences in health insurance coverage and health care-seeking behaviors. Conclusions: Independent of race/ethnicity, indicators of healthcare access are associated with chlamydial infection in young adults. Furthermore, our analyses reveal differences in these associations by gender. Improved healthcare access for young people could help reduce chlamydia-associated reproductive health morbidity potentially through access to chlamydial screening, treatment, sex partner services, and risk reduction counseling.

Sexual behavior and condom practices among Los Angeles women

BACKGROUND The sociodemographic correlates of the number of recent sexual partners and condom use are investigated in a population-based sample of 1,178 unmarried women living in Los Angeles County. RESULTS Asian Americans, foreign born, and older women are less likely to be sexually active and that more educated and previously married women are more likely. Among the sexually active (n = 909), Hispanic women and older women are less likely to have multiple partners, and younger and previously married women more are more likely. African-American women and younger women are more likely to use condoms; older and previously married women are less likely. CONCLUSIONS Results from this study indicate that women-centered primary and secondary prevention efforts may benefit from targeting women not previously considered, such as women of post-reproductive age and divorced women.

Stress symptoms and frequency of sexual intercourse among young women

INTRODUCTION We have previously documented the relationships between stress and depression symptoms and adolescent womens nonuse and misuse of condoms and other contraceptive methods and on their unintended pregnancy rates. AIM Here, we examine relationships between mental health symptoms and another understudied adolescent reproductive health behavior-frequency of sexual intercourse. MAIN OUTCOME MEASURE Our outcome was weekly sexual intercourse activity. METHODS We used panel data from a longitudinal, population-based cohort study of 992 women ages 18-20. Weekly journals measured sociodemographic, relationship, reproductive, and mental health characteristics, sexual and contraceptive behaviors, and pregnancy history. We examined 27,130 surveys from 952 women during the first study year. Predictors of weekly sexual intercourse were moderate to severe stress (Perceived Stress Scale-4) and depression (Center for Epidemiologic Studies Depression Scale-5) symptoms measured at baseline. Multilevel, mixed-effects logistic regression models estimated the relationships between stress and depression symptoms and the weekly odds of sexual intercourse while adjusting for covariate fixed effects and random woman effects. RESULTS Nearly a quarter of the sample had moderate to severe stress (23%) and depression (24%) symptoms at baseline. Women reported sexual intercourse in 36% of weeks. Proportions of sexually active weeks were higher among women with stress (43%) and depression (40%) compared with those without symptoms (35% and 35%, respectively; P values<0.001). Controlling for covariates, women with baseline stress symptoms had 1.6 times higher weekly odds of sexual intercourse compared with women without stress (adjusted odds ratio 1.6, confidence interval [1.1, 2.5]; P=0.04). Depression symptoms were not associated with sexual intercourse frequency in adjusted models. CONCLUSIONS Stress symptoms were positively associated with sexual intercourse frequency among these young women. Research and practice efforts are needed to identify effective sexual health promotion and risk-reduction strategies, including contraceptive education and counseling, in the context of mental health symptoms and unintended pregnancy.

Pregnancy scares and subsequent unintended pregnancy

Background A substantial number of young women experience pregnancy scares – thinking they might be pregnant, and later discovering that they are not. Although pregnancy scares are distressing events, little is known about who experiences them and whether they are important to our understanding of unintended pregnancy. Objective We describe the young women who experience pregnancy scares, and examine the link between pregnancy scares and subsequent unintended pregnancy. Methods We used data from the Relationship Dynamics and Social Life Study. T-tests and regression analyses were conducted using baseline and weekly data to estimate relationships between respondent characteristics and subsequent pregnancy scares. Event history methods were used to assess pregnancy scares as a predictor of unintended pregnancy. Results Nine percent of the young women experienced a pregnancy scare during the study. African-American race, lack of two-parent family structure, lower GPA, cohabitation, and sex without birth control prior to the study are associated with experiencing a pregnancy scare and with experiencing a greater number of pregnancy scares. Further, experiencing a pregnancy scare is strongly associated with subsequent unintended pregnancy, independent of background factors. Forty percent of the women who experienced a pregnancy scare subsequently had an unintended pregnancy during the study period, relative to only 11% of those who did not experience a pregnancy scare. Conclusions Young women from less advantaged backgrounds are more likely to experience a pregnancy scare, and pregnancy scares are often followed by an unintended pregnancy.

Participation in an Intensive Longitudinal Study with Weekly Web Surveys Over 2.5 Years

Background Technological advances have made it easier for researchers to collect more frequent longitudinal data from survey respondents via personal computers, smartphones, and other mobile devices. Although technology has led to an increase in data-intensive longitudinal studies, little is known about attrition from such studies or the differences between respondents who complete frequently administered surveys in a timely manner, and respondents who do not. Objective We examined respondent characteristics and behaviors associated with continued and on-time participation in a population-based intensive longitudinal study, using weekly web-based survey interviews over an extended period. Methods We analyzed data from the Relationship Dynamics and Social Life study, an intensive longitudinal study that collected weekly web-based survey interviews for 2.5 years from 1003 18- and 19-year-olds to investigate factors shaping the dynamics of their sexual behavior, contraceptive use, and pregnancies. Results Ordinary least squares and logistic regression analyses showed background respondent characteristics measured at baseline were associated with the number of days respondents remained enrolled in the study, the number of interviews they completed, and the odds that they were late completing interviews. In addition, we found that changes in pregnancy-related behaviors reported in the weekly interviews were associated with late completion of interviews. Specifically, after controlling for sociodemographic, personality, contact information, and prior experience variables, we found that weekly reports such as starting to have sex (odds ratio [OR] 1.17, 95% CI 1.03-1.32, P=.01), getting a new partner (OR 1.76, 95% CI 1.53-2.03, P<.001), stopping the use of contraception (OR 1.28, 95% CI 1.10-1.49, P=.001), and having a new pregnancy (OR 5.57, 95% CI 4.26-7.29, P<.001) were significantly associated with late survey completion. However, young women who reported changes in pregnancy-related behaviors also had lower levels of study attrition, and completed more interviews overall, than did their counterparts. Conclusions We found that measures of participation in a longitudinal study with weekly web surveys varied not only by respondent characteristics, but also by behaviors measured across the surveys. Our analyses suggest that respondents who experience the behaviors measured by the study may maintain higher participation levels than respondents who do not experience those behaviors.

Black-White Differences in Sex and Contraceptive Use Among Young Women.

This study examines black-white and other sociodemographic differences in young women’s sexual and contraceptive behaviors, using new longitudinal data from a weekly journal-based study of 1,003 18- to 19-year-old women spanning 2.5 years. We investigate hypotheses about dynamic processes in these behaviors during early adulthood in order to shed light on persisting racial differences in rates of unintended pregnancies in the United States. We find that net of other sociodemographic characteristics and adolescent experiences with sex and pregnancy, black women spent less time in relationships and had sex less frequently in their relationships than white women, but did not differ in the number of relationships they formed or in their frequency or consistency of contraceptive use within relationships. Black women were more likely to use less effective methods for pregnancy prevention (e.g., condoms) than white women, who tended to use more effective methods (e.g., oral contraceptives). And although the most effective method for pregnancy prevention—long-acting reversible contraception (LARC)—was used more often by black women than white women, LARC use was low in both groups. In addition, black women did not differ from white women in their number of discontinuations or different methods used and had fewer contraceptive method switches. Further, we find that net of race and adolescent experiences with sex and pregnancy, women from more-disadvantaged backgrounds had fewer and longer (and thus potentially more serious) relationships, used contraception less frequently (but not less consistently), and used less effective methods (condoms) than women from more-advantaged backgrounds.

Effects of Intensive Longitudinal Data Collection on Pregnancy and Contraceptive Use.

We use an experiment based on the relationship dynamics and social life study of sexual behavior, pregnancy, and contraceptive use to investigate whether participation in weekly self-reports over one year result in differential effects on related behaviors and attitudes, compared to participation in a one-time follow-up interview requiring retrospective self-reporting for the prior year. We randomly assigned 200 subjects to either a control group or a journal group. All subjects were interviewed at the beginning of the study (baseline interview) and 12 months later (closeout interview). Subjects in the journal group also completed a five-minute web- or phone-based survey every week during the 12-month study period. We found no statistically significant difference in pregnancy rates across the two groups at closeout. Contrary to our expectation, the control group experienced a slightly larger increase in having ever used a contraceptive method, although this was mainly due to increases in the least effective methods, such as condoms and withdrawal. Respondents in the weekly interview group became slightly more positive toward childbearing in terms of one specific attitude measure, but not for the vast majority of measures. We conclude that intensive longitudinal data collection does not appear to have a large or consistent impact on respondents’ pregnancy, contraceptive use, or related attitudes, relative to the more standard longitudinal approach.

Young Women’s Relationships, Contraception and Unintended Pregnancy in the United States

In this chapter, we describe new research to investigate relationships, contraception and unintended pregnancies during the transition to adulthood. The Relationship Dynamics and Social Life (RDSL) study began with a 60-minute in-person interview about family background and current relationship characteristics. At the conclusion of the interview, respondents were enrolled in the journal-based portion of the study, which consisted of a 5-minute survey via web or phone and occurred weekly for 2.5 years. We begin by describing the prevalence and significance of unintended pregnancy in the United States and the limitations of past research on unintended pregnancy as background for our study. Then we describe the specific aims of our study and its design strengths. Next we provide a description of the young women in our sample, their relationships and their pregnancy intentions as of the baseline interview, as well as a summary of any changes across the weekly journals. Finally, we provide a summary of study findings that provide new insights into the contexts producing unintended pregnancies among young women. The results presented throughout the chapter are preliminary as data collection only recently ended in January 2012.

Sexual Behavior and Contraceptive Use among 18- to 19-Year-Old Adolescent Women by Weight Status: A Longitudinal Analysis

OBJECTIVE To describe the association between weight status and sexual practices among 18- to 19-year-old women. STUDY DESIGN We analyzed a population-based longitudinal study of 18- to 19-year-old women residing in a Michigan county at cohort inception. Weekly journal surveys measured sexual practices, including contraceptive behaviors. Outcomes included proportion of weeks with a partner, proportion of weeks with sexual intercourse, number of partners, average length of relationships, proportion of weeks with contraception use, and proportion of weeks where contraception was used consistently. We examined 26,545 journal surveys from 900 women over the first study year. Ordinary least squares regression models for each outcome examined differences by weight status, controlling for sociodemographic characteristics. RESULTS The mean proportion of weeks in which adolescents reported sexual intercourse was 52%; there was no difference by weight status. Among weeks in which adolescents reported sexual activity, obese adolescents had a lower proportion of weeks where any contraception was used compared with normal weight adolescents (84% vs 91%, P = .011). Among weeks in which adolescents reported sexual activity and contraceptive use, obese adolescents had a lower proportion of weeks with consistent contraceptive use (68% vs 78%, P = .016) and oral contraceptive pill use (27% vs 45%, P = .001) compared with normal weight adolescents. All other relationships by weight status were not statistically significant. CONCLUSIONS In this longitudinal study, obese adolescent women were less likely to use contraception, and less likely to use it consistently when compared with normal weight peers. Findings suggest obesity may be an important factor associated with adolescent womens sexual behavior.