We propose an assessment of adolescent sexual behaviors and outcomes that compares Mexican immigrants with US-born Mexican-American and county of origin (Mexican) counterparts. This study will compare outcomes and individual, family, and community factors associated with outcomes across subpopulations The specific aims are to:

Aim 1. Evaluate disparities in adolescent birth, pregnancy, age at first sex, contraceptive use and desired fertility among US-born non-Hispanic whites, US-born Mexican-Americans, Mexican immigrants residing in the US, and Mexican women residing in Mexico. Hypothesis: There is variation among subpopulations, and Mexican-born immigrants more closely resemble their Mexican
counterparts than Mexican-Americans or US-born non-Hispanic whites.

Aim 2. Identify individual, family, health system, and community-level factors associated with adolescent birth, pregnancy, age at first sex, contraceptive use, and desired fertility among USborn non-Hispanic whites, US-born Mexican-Americans, Mexican immigrants residing in the US, and Mexican women residing in Mexico. Hypotheses: individual and contextual factors associated with adolescent pregnancy are similar across subpopulations (e.g. poverty, maternal history of adolescent pregnancy).