Full text: Available Index: LILACS (Americas) Main subject: Health Status Indicators Type of study: Etiology study / Prognostic study / Risk factors Limits: Adolescent / Adult / Child / Female / Humans / Male Country/Region as subject: Mexico Language: Spanish Journal: Salud pública Méx Journal subject: Public Health Year: 2003 Type: Article Affiliation country: Mexico Institution/Affiliation country: Instituto Mexicano del Seguro Social/MX