Table 1

Post-ban quit ratio by time interval since implementation of smoking ban, US hospital and community employees, 1994-96

Time1-150Hospital employeesCommunity employeesp Value1-151Odds ratio1-151
n (quit/total)Quit ratio95% CIn (quit/total)Quit ratio95% CI
6 months24/8160.030(0.018 to 0.041)17/10330.016(0.009 to 0.024)0.1151.66
1 year42/8080.052(0.037 to 0.067)30/10260.029(0.019 to 0.039)0.0191.77
18 months48/8030.088(0.069 to 0.108)71/10180.047(0.034 to 0.060)0.0011.97
2 years75/7660.098(0.077 to 0.118)62/10130.061(0.047 to 0.076)0.0031.72
3 years101/6950.145(0.120 to 0.171)88/9520.092(0.075 to 0.110)0.0011.68
4 years120/6250.192(0.162 to 0.222)93/7830.119(0.097 to 0.141)0.0011.83
5 years106/4720.225(0.188 to 0.261)94/6020.156(0.128 to 0.184)0.0051.58
6 years90/3230.279(0.231 to 0.326)53/3770.141(0.107 to 0.175)0.0012.40
7 years43/1680.256(0.192 to 0.319)27/1900.142(0.093 to 0.191)0.0201.91
8 years18/780.231(0.141 to 0.321)20/940.213(0.134 to 0.291)0.7621.12
9 years6/150.400(0.152 to 0.648)5/230.217(0.049 to 0.386)0.2312.40
  • 1-150 Time 0 is not the same for each respondent since all bans were not implemented at the same time. Consequently, time is not cross-sectional across all respondents.

  • 1-151 For hospital employees compared with community employees. All odds ratios are adjusted for hospital-community pairings.

  • CI, confidence interval