title: Birth order and hospitalization for alcohol and narcotics use in Sweden.
abstract: Previous studies have shown that birth order is an important predictor of later life health as well as socioeconomic attainment. In this study, we examine the relationship between birth order and hospitalization for alcohol and narcotics use in Sweden.
  
  
  
  We study the relationship between birth order and hospitalization related to alcohol and narcotics use before and after the age of 20 using Swedish register data for cohorts born 1987-1994. We apply Cox proportional hazard models and use sibling fixed effects, eliminating confounding by factors shared by the siblings.
  
  
  
  Before age 20 we find that later born siblings are hospitalized for alcohol use at a higher rate than first-borns, and there is a monotonic increase in the hazard of hospitalization with increasing birth order. Second-borns are hospitalized at a rate 47% higher than first-borns, and third-borns at a rate 65% higher. Similar patterns are observed for hospitalization for narcotics use. After age 20 the pattern is similar, but the association is weaker. These patterns are consistent across various sibling group sizes.
  
  
  
  Later born siblings are more likely to be hospitalized for both alcohol and narcotics use in Sweden. These birth order effects are substantial in size, and larger than the estimated sex differences for the risk of hospitalization related to alcohol and drug use before age 20, and previous estimates for socioeconomic status differences in alcohol and drug abuse.
authors: Department of Social Policy, London School of Economics and Political Science, London WC2A 2AE, UK; Department of Sociology, Stockholm University, 106 91 Stockholm, Sweden; Max Planck Institute for Demographic Research, 18057 Rostock, Germany. Electronic address: k.j.barclay@lse.ac.uk.
authors: Kieron
authors: K
authors: Barclay
authors: Department of Social Policy, London School of Economics and Political Science, London WC2A 2AE, UK; Max Planck Institute for Demographic Research, 18057 Rostock, Germany; Population Research Unit, Department of Social Research, University of Helsinki, 00014 Helsinki, Finland.
authors: Mikko
authors: M
authors: Myrskylä
authors: Department of Public Health Sciences, Karolinska Institutet, 171 77 Stockholm, Sweden.
authors: Per
authors: P
authors: Tynelius
authors: Department of Public Health Sciences, Karolinska Institutet, 171 77 Stockholm, Sweden.
authors: Daniel
authors: D
authors: Berglind
authors: Department of Public Health Sciences, Karolinska Institutet, 171 77 Stockholm, Sweden.
authors: Finn
authors: F
authors: Rasmussen
mesh_terms: D000293:Adolescent; D000328:Adult; D000437:Alcoholism / Q000453:epidemiology* / Q000523:psychology; D001722:Birth Order / Q000523:psychology*; D005260:Female; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D009293:Opioid-Related Disorders / Q000453:epidemiology* / Q000523:psychology; D016016:Proportional Hazards Models; D035781:Siblings / Q000523:psychology*; D013548:Sweden / Q000453:epidemiology; D055815:Young Adult
keywords: Adolescence; Alcohol; Birth order; Fixed effects; Hospitalization; Narcotics; Sweden