Apresentação

Abstract

In this supplement you will fi nd a series of articles investigating various aspects of life of more than 4,000 young adults included in the 1982 birth cohort of the city of Pelotas, Southern Brazil. Socioeconomic differences in health indicators in the fi rst four years of life of this cohort were collected and published in a book, Epidemiology of Inequality, 20 years ago. In the book, a we analyzed the main outcomes during childhood, i.e., low birth weight, nutritional status and child mortality for all children born in 1982, stressing the huge impact of social inequalities on each aspect of life studied.

Sleep Duration in Adolescence and Its Prenatal, Perinatal, and Health Determinants in a Large Population-based Cohort Followed from Birth

“…The variables obtained in the perinatal study were as follows: socioeconomic index (National Economic Indicator [IEN]), was established by performing a main component analysis of the 12 consumer goods and education levels of the head of the family (subsequently categorized into quintiles) 18 ; mother's education (completed years of education), which was divided into four categories (0, 1–4, 5–9, or >9 years); mother's age in full years (divided into three categories: <20, 20–34, or ≥35 years); maternal smoking status during pregnancy, which was determined by the answering the question, “Did you smoke during pregnancy?”; alcohol consumption during pregnancy, which was determined by asking the mother if she used to drink alcohol during pregnancy; presence of depression or nervous problem during pregnancy, which was determined by the answering the question, “Did you have depression or any emotional problems during pregnancy?”; type of delivery (vaginal/cesarean); gestational age, which was identified using the Dubowitz method 19 (prematurity: <37 weeks); adolescent sex (woman/man); adolescent's skin color (white/black/others); birth weight (recorded in the birth certificate) (low birth weight (LBW): <2,500 g); and 5-minute Apgar score (dichotomized into <7 points or ≥7 points).…”