Importance The requirement of a childhood onset has always been a key criterion for the
diagnosis of attention-deficit/hyperactivity disorder (ADHD) in adults, but recently this …

Purpose This study aimed to review evidence on the prevalence of and risk factors for
conduct problems in Brazil. Methods We searched electronic databases and contacted …

Background A novel approach is explored for improving causal inference in observational
studies by comparing cohorts from high-income with low-or middle-income countries (LMIC) …

Objective To examine the effects of early social, anthropometric, and behavioural variables
on physical activity in adolescence. Design Prospective birth cohort study. Setting Pelotas …

Background: This investigation aimed at examining, through an epidemiological study, the
social demographic, family and individual determinants of behaviour problems in preschool …

Background Few studies have addressed the course and severity of maternal depression
and its effects on child psychiatric disorders from a longitudinal perspective. This study …

All births occurring in Pelotas (N ¼ 5265), from 1 January to 31 December 1993, were
enrolled and 5249 agreed to take part in the longitudinal study. In the original cohort profile …

This paper describes the main methodological aspects of a cohort study, with emphasis on
its recent phases, which may be relevant to investigators planning to carry out similar …

OBJECTIVE: To explore associations of maternal prenatal smoking and child psychological
problems and determine the role of causal intrauterine mechanisms. PATIENTS AND …

Objective To estimate the prevalence of psychiatric disorders in preadolescents aged 11–12
years from a birth cohort in a southern Brazilian city. Methods This is a cross-sectional …