title: Comprehensive US Statewide Smoke-Free Indoor Air Legislation and Secondhand Smoke Exposure, Asthma Prevalence, and Related Doctor Visits: 2007-2011.
abstract: OBJECTIVE
  We evaluated the impact of comprehensive statewide smoke-free indoor air laws on secondhand smoke (SHS) exposure, asthma prevalence, and asthma-related doctor visits.
  
  
  METHODS
  We used the 2007-2011 Behavioral Risk Factor Surveillance System data sets. We employed a paired t test to determine whether comprehensive statewide smoke-free indoor air laws reduced SHS exposure. We performed weighted logistic and Poisson regressions to obtain likelihood of reporting asthma symptoms and incidence rate ratio (IRR) of doctor visits owing to severe asthma symptoms.
  
  
  RESULTS
  After such laws were enacted, people in states with comprehensive smoke-free indoor air laws had a lower level of SHS exposure (P < .01), decreased odds of reporting current asthma symptoms (adjusted odds ratio [AOR] = 0.57; 95% confidence interval [CI] = 0.51, 0.63), and a decreased frequency of doctor's visits owing to severe asthma symptoms (IRR = 0.80; 95% CI = 0.69, 0.92) than did their counterparts in fully adjusted models.
  
  
  CONCLUSIONS
  Comprehensive statewide smoke-free indoor air laws appear to be effective in reducing SHS exposure and improving asthma outcomes. Regulations requiring smoke-free indoor environments and public areas are beneficial, and smoke-free indoor air laws should be enforced in all states.
authors.affiliation: Hsien-Chang Lin and Ji-Yeun Park are with the Department of Applied Health Science, Indiana University School of Public Health, Bloomington. Dong-Chul Seo is with the Department of Health Education and Management, College of Health Sciences, Ewha Womans University, Seoul, South Korea.
authors.forename: Hsien-Chang
authors.initials: HC
authors.lastname: Lin
authors.affiliation: Hsien-Chang Lin and Ji-Yeun Park are with the Department of Applied Health Science, Indiana University School of Public Health, Bloomington. Dong-Chul Seo is with the Department of Health Education and Management, College of Health Sciences, Ewha Womans University, Seoul, South Korea.
authors.forename: Ji-Yeun
authors.initials: JY
authors.lastname: Park
authors.affiliation: Hsien-Chang Lin and Ji-Yeun Park are with the Department of Applied Health Science, Indiana University School of Public Health, Bloomington. Dong-Chul Seo is with the Department of Health Education and Management, College of Health Sciences, Ewha Womans University, Seoul, South Korea.
authors.forename: Dong-Chul
authors.initials: DC
authors.lastname: Seo
mesh_terms: D001249:Asthma / Q000453:epidemiology* / Q000628:therapy; D040343:Behavioral Risk Factor Surveillance System; D002648:Child; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D016012:Poisson Distribution; D015995:Prevalence; D061845:Smoke-Free Policy / Q000331:legislation & jurisprudence*; D013219:State Government; D014028:Tobacco Smoke Pollution / Q000706:statistics & numerical data*; D014481:United States / Q000453:epidemiology
chemical_list: D014028:Tobacco Smoke Pollution