title: Prospective cohort study on television viewing time and incidence of lung cancer: findings from the Japan Collaborative Cohort Study.
abstract: OBJECTIVE
  To ascertain whether prolonged television viewing time was associated with lung cancer incidence in Japanese adults aged 40-79 years from a nationwide large-scale cohort study.
  
  
  METHODS
  A total of 54,258 adults (23,090 men and 31,168 women) without a history of cancer at baseline (1988-1990) were enrolled and followed for a median of 15.6 years. The Cox proportional hazard model was used to calculate hazard ratios (HRs) and 95 % confidence interval (CI) for lung cancer according to television viewing time adjusted for age and other possible confounding factors.
  
  
  RESULTS
  During the study period, 798 participants were diagnosed with lung cancer. The HR of male participants who watched television for more than 4 h daily was 1.36 (95 % CI 1.04-1.80) compared with <2 h/day.
  
  
  CONCLUSIONS
  Our findings suggest that reducing the amount of time spent watching television may be beneficial for preventing lung cancer.
authors.affiliation: Department of Public Health, Hokkaido University Graduate School of Medicine, N15 W7, Kita-ku, Sapporo, Hokkaido, 060-0812, Japan.
authors.forename: Shigekazu
authors.initials: S
authors.lastname: Ukawa
authors.forename: Akiko
authors.initials: A
authors.lastname: Tamakoshi
authors.forename: Kenji
authors.initials: K
authors.lastname: Wakai
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Noda
authors.forename: Masahiko
authors.initials: M
authors.lastname: Ando
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Iso
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D007564:Japan / Q000453:epidemiology; D008175:Lung Neoplasms / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D011446:Prospective Studies; D057185:Sedentary Behavior; D013690:Television / Q000706:statistics & numerical data*; D013997:Time Factors