Abstracts / Contraception 84 (2011) 302–336 25%. Multivariable analyses showed changes over the two NSFG cycles. Hispanic race and marital status were no longer significantly associated with ever-use of the IUD, and black race and parity were no longer significantly associated with ever-use of DMPA. Increasing parity remained significantly associated with ever-use of the IUD in 2006–2008 (OR 52.8, 95% CI 8.85– 315.0 for one child; OR 119.9, 95% CI 16.7–859.2 for two or more children). As in the 2002 NSFG, history of teen pregnancy was associated with ever-use of DMPA (OR 1.79, 95% CI 1.02–3.15) but not of the IUD. Conclusions: While some factors such as marital status and race are no longer significantly associated with use of long-acting reversible contraceptive methods in young women, some important correlates such as parity remain associated with ever-use of the IUD. P32 PREDICTORS OF LONG-ACTING REVERSIBLE CONTRACEPTION USE AMONG UNMARRIED YOUNG ADULTS Dempsey A Medical University of South Carolina, Charleston, SC, USA 317 2008. We conducted simple logistic regression and multinomial logistic regression analyses with adjustments for the sampling design to identify demographic and reproductive health characteristics predictive of LARC use. Results: LARC use among contracepting US women increased from 2.4% in 2002 to 5.6% in 2006–2008. The largest increases in LARC use occurred among the youngest and oldest age groups, non-Hispanic white and nonHispanic black women, US-born women and those in the highest income group. High prevalence of LARC use in 2006–2008 was seen among women who had given birth once or twice (10%), foreign-born women (8.8%) and Hispanic women (8.4%). After adjusting for key demographic and reproductive health characteristics, in comparisons to users of other contraceptive methods and to noncontraceptors at risk of unintended pregnancy, foreign-born women and women who experienced coitarche before age 18 were about twice as likely to be LARC users compared to women without those characteristics. Conclusions: A more diverse population of women used LARC methods in 2006–2008, as compared to 2002. However, there is likely more potential for increased voluntary uptake, especially among populations historically not considered to be candidates for LARC methods. P34 Savage A, Billingsley C, Korte J Objectives: This analysis identifies predictors of long-acting reversible contraception (LARC) use and knowledge of intrauterine contraception (IUC) among unmarried young adults at risk of unintended pregnancy. Methods: This is a secondary analysis of a national survey of fertility and contraceptive knowledge conducted by the Guttmacher Institute. Data were collected via phone interviews with a nationally representative probabilitybased sample of unmarried women and men ages 18 to 29. Our analysis includes women and men at risk for unintended pregnancy. Data were analyzed using a chi-square test for categorical variables and logistic regression to construct multivariable models. Results: Among the population at risk for unintended pregnancy (n=1222), 4% were currently using a LARC method (IUC=52, implant=4). Current LARC use was associated with older age, high IUC knowledge and earlier onset of sexual activity. Respondents with high IUC knowledge were six times more likely to be current LARC users (OR 6.3, 95% CI 1.4–28.8). Gender, insurance status, primary language, education level and use of public assistance did not predict current LARC use. Low knowledge of IUC was more likely among males, non-English speakers, those with high school education or less, and those with an external locus of control. Conclusions: Knowledge of IUC is an important modifiable characteristic that may improve LARC use among young, unmarried adults. Interventions to improve knowledge about IUC should target males, non-English speakers, those with lower educational attainment and those with an external locus of control. P33 WHO USES LONG-ACTING REVERSIBLE CONTRACEPTIVE METHODS IN THE UNITED STATES? Kavanaugh M Guttmacher Institute, New York, NY, USA COMPARISON OF UNINTENDED PREGNANCY RATES IN USERS OF 84/7, 21/7 AND 24/4 ORAL CONTRACEPTIVE REGIMENS USING THE I3 INVISION™ DATABASE Howard B Teva Branded Pharmaceutical Products R&D, Inc., Horsham, PA, USA Brewster C, Lage M Objectives: To compare unintended pregnancy rates between oral contraceptive (OC) users of three regimens: 84 days levonorgestrel/ethinyl estradiol (EE) 0.15 mg/0.03 mg tablets plus EE 0.01 mg for 7 days in place of placebo; 21 days combined EE/progestin plus 7 days placebo; and 24 days EE/progestin plus 4 days placebo over the course of 1 year. Methods: Data for this study were obtained from the i3 Invision™ Data Mart for the period from January 1, 2006, through March 31, 2010. Only women 15 to 40 years were included in the analysis. Two distinct analyses were performed, one comparing the 84/7 to 21/7 medications and the other comparing the 84/7 to 24/4 medications. The outcome of interest was pregnancy (diagnosis code of V22.xx or V23.xx) over the 1-year post index date. The 84/7 cohort was matched to the cohort of interest based upon age, sex, region, business type of insurance, insurance product and year of index date. Results: The proportions of women in the 15-to-40 age range for the 84/7, 21/ 7 and 24/4 medications were 5821 of 7236, 650,816 of 780,131 and 111,540 of 127,913, respectively. Pregnancy rate for users of the 84/7 regimen were 3.04% compared to 5.12% for users of the 21/7 regimen (pb.0001). Pregnancy rate for users of the 84/7 regimen were 3.03% compared to 5.28% for users of the 24/4 regimens (pb.0001). Conclusions: In this study, unintended pregnancy rates were significantly lower in women using an 84/7 OC regimen compared to 21/7 and 24/4 regimens. P35 WHO USES ANAL SEX FOR BIRTH CONTROL? Jerman J, Hubacher D, Kost K, Finer L Objectives: To examine characteristics of US women associated with use of long-acting reversible contraception (LARC) and changes in these characteristics between 2002 and 2006–2008. Methods: We analyzed data on current contraceptive use from two nationally representative samples of women ages 15 to 44 in the National Survey of Family Growth, including 7643 women in 2002 and 7356 women in 2006– Wiebe E University of BC, Vancouver, BC, Canada Objectives: To determine the rate, characteristics and experience of women who said they had used anal sex as a method of contraception. Methods: This was a questionnaire survey of women presenting for abortion. Demographic data including ethnicity, country of origin and length of residence in Canada were collected.