RESUMEN

The scope of this article was to describe the urban work patterns among 14 to 15-year-old youths from Southern Brazil. Child labor was characterized as any activity that resulted in retribution in the form of goods, services or money. The analyses were stratified by sex and economic level. Of the 4325 adolescents interviewed, the proportion of labor in the last year was 22.2%, namely 27.7% for the male sex, and 17% for the female sex. This proportion was also higher among the poorer strata of the population (30.0%) than the more affluent (14.3%). The majority of adolescents worked away from home and approximately half of them began working before 14 years of age, and around 80.0% reported that they worked by choice. Only 1.0% had a labor contract or work booklet, 30.0% worked more than six hours per day, and the average income was less than US$85/month. Domestic work predominated among the poorest teenagers. There is a need for greater surveillance of child labor and of interventions seeking to enforce prevailing legislation.

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The scope of this article was to describe the urban work patterns among 14 to 15-year-old youths from Southern Brazil. Child labor was characterized as any activity that resulted in retribution in the form of goods, services or money. The analyses were stratified by sex and economic level. Of the 4325 adolescents interviewed, the proportion of labor in the last year was 22.2%, namely 27.7% for the male sex, and 17% for the female sex. This proportion was also higher among the poorer strata of the population (30.0%) than the more affluent (14.3%). The majority of adolescents worked away from home and approximately half of them began working before 14 years of age, and around 80.0% reported that they worked by choice. Only 1.0% had a labor contract or work booklet, 30.0% worked more than six hours per day, and the average income was less than US$85/month. Domestic work predominated among the poorest teenagers. There is a need for greater surveillance of child labor and of interventions seeking to enforce prevailing legislation.

O objetivo deste artigo foi descrever os padrões de trabalho urbano em jovens de 14-15 anos do Sul do Brasil. O trabalho infantil foi caracterizado como qualquer atividade que resultasse em retribuição na forma de bens, serviços ou dinheiro. As análises foram estratificadas por sexo e nível econômico. Dos 4325 adolescentes entrevistados, a proporção de trabalho no último ano foi de 22,2%, sendo 27,7% para o sexo masculino e 17,0% para o sexo feminino. Essa proporção também foi maior para as classes D/E (30,0%) do que para as classes A/B (14,3%). A maioria dos adolescentes trabalhava fora de casa, aproximadamente metade começou a trabalhar antes dos 14 anos e cerca de 80,0% referiram trabalhar por interesse próprio. Apenas 1,0% tinha contrato ou carteira de trabalho, 30,0% trabalhavam mais de seis horas por dia, e a renda média foi menor do que R$ 150/mês. Os serviços domésticos predominaram entre os mais pobres. Existe a necessidade de maior monitoramento do trabalho infantil e de intervenções que busquem o cumprimento da legislação vigente.

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BACKGROUND: Prospective studies on physical activity (PA), diet, and body composition in adolescents are lacking, particularly outside high-income countries. GOALS: To describe the methods used to assess these variables in the 1993 Pelotas (Brazil) Birth Cohort and to discuss the fieldwork challenges faced and alternatives to overcome them. METHODS: In 2006-07 a subsample of the 1993 Pelotas cohort was revisited. PA was estimated using questionnaires, a combined heart-rate and motion sensor (Acti-Heart), and the ActiGraph GT1M accelerometer. Diet was investigated by questionnaire. Total body water was determined by stable isotopes. Thirty individuals had their total energy expenditure assessed by doubly labeled water. All data were collected at participants' home. RESULTS: The logistics of the fieldwork and the difficulties in undertaking the study and alternatives to overcome them are presented. Preliminary analyses show that 511 individuals were traced (response rate = 90.0%). Compliance of both adolescents and their families for the motion sensors and body-composition measurements was excellent. CONCLUSIONS: The authors conclude that it is feasible to carry out high-quality studies on PA in developing countries. They hope the article will be useful to other researchers interested in carrying out similar studies.

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Descrever aspectos metodológicos do estudo da coorte de crianças que podem ser relevantes para pesquisadores que estejam planejando investigações semelhantes. Em 1993, uma coorte de base populacional foi recrutada em Pelotas, RS. Os 5.249 recém-nascidos nos hospitais da cidade foram acompanhados com um, três e seis meses, e com um e quatro anos de idade. Subestudos estão sendo realizados sobre saúde bucal, desenvolvimento psicológico e saúde mental, composição corporal e aspectos etnográficos. Em 2004-5 foi possível entrevistar 87,5 por cento da coorte inicial, com a idade de 10-12 anos. Estudos de coortes de nascimentos são essenciais para investigar os determinantes precoces da morbidade e estado nutricional de adultos. No entanto, há poucos estudos com esta metodologia em países de renda média e baixa, e alguns dos determinantes da situação de saúde podem ser distintos daqueles observados em países ricos.

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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 studies. In 1993, a population based study was launched in Pelotas, Southern Brazil. All 5,249 newborns delivered in the city's hospitals were enrolled, and sub-samples were visited at the ages of one, three and six months and of one and four years. In 2004-5 it was possible to trace 87.5% of the cohort at the age of 10-12 years. Sub-studies are addressing issues related to oral health, psychological development and mental health, body composition, and ethnography. Birth cohort studies are essential for investigating the early determinants of adult disease and nutritional status, yet few such studies are available from low and middle-income countries where these determinants may differ from those documented in more developed settings.

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