Multinomial model and zero-inflated gamma model to study time spent on leisure time physical activity: an example of ELSA-Brasil

Autores

  • Aline Araújo Nobre Fundação Oswaldo Cruz
  • Marilia Sá Carvalho Fundação Oswaldo Cruz
  • Rosane Härter Griep Fundação Oswaldo Cruz; Instituto Oswaldo Cruz
  • Maria de Jesus Mendes da Fonseca Fundação Oswaldo Cruz; Escola Nacional de Saúde Pública
  • Enirtes Caetano Prates Melo Fundação Oswaldo Cruz; Escola Nacional de Saúde Pública
  • Itamar de Souza Santos Universidade de São Paulo; Faculdade de Medicina
  • Dora Chor Fundação Oswaldo Cruz; Escola Nacional de Saúde Pública

DOI:

https://doi.org/10.11606/s1518-8787.2017051006882

Palavras-chave:

Motor Activity, Leisure Activities, Regression Analysis, Models, Statistical

Resumo

OBJECTIVE To compare two methodological approaches: the multinomial model and the zero-inflated gamma model, evaluating the factors associated with the practice and amount of time spent on leisure time physical activity. METHODS Data collected from 14,823 baseline participants in the Longitudinal Study of Adult Health (ELSA-Brasil – Estudo Longitudinal de Saúde do Adulto ) have been analysed. Regular leisure time physical activity has been measured using the leisure time physical activity module of the International Physical Activity Questionnaire. The explanatory variables considered were gender, age, education level, and annual per capita family income. RESULTS The main advantage of the zero-inflated gamma model over the multinomial model is that it estimates mean time (minutes per week) spent on leisure time physical activity. For example, on average, men spent 28 minutes/week longer on leisure time physical activity than women did. The most sedentary groups were young women with low education level and income CONCLUSIONS The zero-inflated gamma model, which is rarely used in epidemiological studies, can give more appropriate answers in several situations. In our case, we have obtained important information on the main determinants of the duration of leisure time physical activity. This information can help guide efforts towards the most vulnerable groups since physical inactivity is associated with different diseases and even premature death.

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Publicado

2017-01-01

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Nobre, A. A., Carvalho, M. S., Griep, R. H., Fonseca, M. de J. M. da, Melo, E. C. P., Santos, I. de S., & Chor, D. (2017). Multinomial model and zero-inflated gamma model to study time spent on leisure time physical activity: an example of ELSA-Brasil. Revista De Saúde Pública, 51, 76. https://doi.org/10.11606/s1518-8787.2017051006882