title: Impact of obesity, overweight and underweight on life expectancy and lifetime medical expenditures: the Ohsaki Cohort Study.
abstract: OBJECTIVE
  People who are obese have higher demands for medical care than those of the normal weight people. However, in view of their shorter life expectancy, it is unclear whether obese people have higher lifetime medical expenditure. We examined the association between body mass index, life expectancy and lifetime medical expenditure.
  
  
  METHODS
  Prospective cohort study using individual data from the Ohsaki Cohort Study.
  
  
  METHODS
  Miyagi Prefecture, northeastern Japan.
  
  
  METHODS
  The 41 965 participants aged 40-79 years.
  
  
  METHODS
  The life expectancy and lifetime medical expenditure aged from 40 years.
  
  
  RESULTS
  In spite of their shorter life expectancy, obese participants might require higher medical expenditure than normal weight participants. In men aged 40 years, multiadjusted life expectancy for those who were obese participants was 41.4 years (95% CI 38.28 to 44.70), which was 1.7 years non-significantly shorter than that for normal weight participants (p=0.3184). Multiadjusted lifetime medical expenditure for obese participants was £112 858.9 (94 954.1-131 840.9), being 14.7% non-significantly higher than that for normal weight participants (p=0.1141). In women aged 40 years, multiadjusted life expectancy for those who were obese participants was 49.2 years (46.14-52.59), which was 3.1 years non-significantly shorter than for normal weight participants (p=0.0724), and multiadjusted lifetime medical expenditure was £137 765.9 (123 672.9-152 970.2), being 21.6% significantly higher (p=0.0005).
  
  
  CONCLUSIONS
  According to the point estimate, lifetime medical expenditure might appear to be higher for obese participants, despite their short life expectancy. With weight control, more people would enjoy their longevity with lower demands for medical care.
authors.affiliation: Division of Epidemiology, Department of Public Health and Forensic Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan.
authors.forename: Masato
authors.initials: M
authors.lastname: Nagai
authors.forename: Shinichi
authors.initials: S
authors.lastname: Kuriyama
authors.forename: Masako
authors.initials: M
authors.lastname: Kakizaki
authors.forename: Kaori
authors.initials: K
authors.lastname: Ohmori-Matsuda
authors.forename: Toshimasa
authors.initials: T
authors.lastname: Sone
authors.forename: Atsushi
authors.initials: A
authors.lastname: Hozawa
authors.forename: Miyuki
authors.initials: M
authors.lastname: Kawado
authors.forename: Shuji
authors.initials: S
authors.lastname: Hashimoto
authors.forename: Ichiro
authors.initials: I
authors.lastname: Tsuji