LAUSR

We report on baseline findings from NenUnkUmbi/EdaHiYedo, a community based participatory research randomized controlled trial with American Indian adolescents to reduce sexual and reproductive health disparities. American Indian adolescents aged 13-19 years participated in a baseline survey that was administered in five schools. We used zero-inflated negative binomial regression to evaluate how the count of protected sexual acts was associated with independent variables of interest. We stratified models by self-reported gender of adolescents and tested for a two-way interaction effect between gender and the independent variable of interest. Two hundred twenty-three girls and 222 boys (n = 445) were sampled. The average number of lifetime partners was 1.0 (standard deviation = 1.7). Each additional lifetime partner was associated with a 50% increase in the number of protected sexual acts incident rate ratio (IRR = 1.5, 95% confidence interval [CI] 1.1-1.9) and more than a twofold increase in the likelihood of not having protected sexual acts (adjusted odd ratio [aOR] = 2.6, 95% CI 1.3-5.1). Each additional number of substances used in adolescentss' lifetime was associated with an increased likelihood of not having protected sexual acts (aOR = 1.2, 95% CI 1.0-1.5). In boys, each one standard deviation increase in depression severity was associated with a 50% reduction in the number of times a condom was used adjusted IRR (aIRR = 0.5, 95% CI 0.4-0.6, p < .001). Each 1-unit increase in positive prospections of pregnancy was associated with a pronounced decrease likelihood of not having protected sexual acts (aOR = 0.01, 95% CI 0.0-0.1). Findings support the importance of tribally driven tailoring of sexual and reproducive health interventions and services for American Indian adolescents.