title: Physical activity and social status in adolescence as predictors of physical inactivity in adulthood.
abstract: BACKGROUND
  Physical inactivity is related to an increased risk of certain chronic diseases. The aim here was to evaluate how physical activity and social status in adolescence are associated with physical inactivity in adulthood.
  
  
  METHODS
  The sample comprised 3664 males and 4130 females who answered questions on physical activity and social status at 14 and 31 years of age in follow-up surveys of the Northern Finland birth cohort of 1966. Associations between explanatory factors and physical inactivity in adulthood were analyzed using multivariable logistic regression.
  
  
  RESULTS
  Infrequent participation in sports after school hours at 14 years of age and, in males, additionally a low grade in school sports, was associated with physical inactivity at the age of 31 years, independent of social circumstances in adulthood. Low social class of the childhood family was associated with physical inactivity in adolescence but not with inactivity at 31 years of age. Poor school achievement in adolescence was associated with adult inactivity independent of adolescent physical activity.
  
  
  CONCLUSIONS
  Infrequent participation in sports, a low grade in school sports, and poor school achievements in adolescence were associated with physical inactivity in adulthood. Participation in sports is to be strongly supported among all adolescents because of its long-term beneficial effects on adult health through its tendency to reduce the probability of adult inactivity.
mesh_terms: D000293:Adolescent; D041923:Adolescent Development; D000328:Adult; D015444:Exercise; D005260:Female; D005387:Finland; D006801:Humans; D008019:Life Style; D008297:Male; D012923:Social Class