title: Study of a population of adolescents at risk.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D001519:Behavior; D003267:Contraception; D003268:Contraception Behavior; D003625:Data Collection; D003695:Delivery of Health Care; D003710:Demography; D019049:Developed Countries; D004467:Economics; D005060:Europe; D005193:Family Planning Services; D006262:Health; D006296:Health Services; D006301:Health Services Needs and Demand; D011153:Population; D011154:Population Characteristics; D011174:Portugal; D011203:Poverty; D011320:Primary Health Care; D012106:Research; D012494:Sampling Studies; D012725:Sexual Behavior; D012923:Social Class; D012959:Socioeconomic Factors; D014505:Urban Population
keywords: Adolescents; Age Factors; Behavior; Contraception; Contraceptive Usage; Delivery Of Health Care; Demographic Factors; Developed Countries; Economic Factors; Europe; Family Planning; Health; Health Services; Low Income Population; Needs; Population; Population Characteristics; Portugal; Premarital Sex Behavior; Primary Health Care; Research Methodology; Sampling Studies; Sex Behavior; Social Class; Socioeconomic Factors; Socioeconomic Status; Southern Europe; Studies; Surveys; Urban Population; Youth