[Mental health problems among pregnant and non-pregnant youth]

To estimate the prevalence of mental health problems in primiparous adolescents and to compare their mental health profile with the profile of sexually active adolescents who have never gotten pregnant.

Cross-sectional study that compared two groups of adolescents aged 13 to 17 years from a city in Southern Brazil, 2003-2004. The sample included 207 primiparous who attended prenatal care programs in urban public services, and 308 sexually active students from state public schools who had never gotten pregnant. A screening instrument to identify mental health problems in adolescents (Brazilian version of the Youth Self-Report) was applied to the participants together with a questionnaire on risk factors for pregnancy in adolescence. Statistical analysis included Chi-square tests, Fisher's exact test, Mann Whitney's U and logistic regression models.

Pregnant and non-pregnant adolescents did not differ in the prevalence of total mental health problems (24.6% vs. 27.3%; p=0.50). Compared to the group of never pregnant adolescents, the group of primiparous presented higher prevalence of anxious/depressive symptoms (24.2% vs. 15.3%; p=0.01) and withdrawn/depressed symptoms (13.0% vs., 4.5%; p<0.001) and there was a greater number of tobacco users (21.3% vs. 11.0%; p=0.002). These differences were confirmed by logistic regression models controlled for maternal education.

Anxiety and depression symptoms and tobacco use were more frequent in pregnant adolescents in comparison to non-pregnant. These problems require special attention from prenatal care services in order to avoid potential damages for the health of mothers and their children.