Table 3

Odds ratio (95% CI) of support for total smoking ban in indoor areas of public places over three waves (in 2005, 2008 and 2010) of the ITC Korea Survey

Workplace
(n=3475)
Restaurants or cafes
(n=3530)
Drinking establishments
(n=3494)
Notice anti-smoking advertising or information
 No1.001.001.00
 Yes0.91 (0.76 to 1.09)0.94 (0.79 to 1.13)1.08 (0.85 to 1.38)
Smoke is dangerous to non-smokers
 Do not agree/neither agree nor disagree1.001.001.00
 Strongly agree or agree1.55 (1.17 to 2.04)*1.25 (0.95 to 1.66)1.44 (0.96 to 2.14)
Age (years)
 18–241.001.001.00
 25–392.08 (1.25 to 3.48)*0.97 (0.61 to 1.53)1.40 (0.61 to 3.24)
 40–542.50 (1.44 to 4.32)*0.93 (0.56 to 1.54)2.36 (0.96 to 5.80)
 55+2.32 (1.31 to 4.11)*1.10 (0.65 to 1.87)3.64 (1.48 to 8.96)*
Gender
 Male1.001.001.00
 Female0.65 (0.41 to 1.03)0.61 (0.38 to 0.98)*0.49 (0.26 to 0.90)*
Marital status
 Married1.001.001.00
 Never married0.90 (0.67 to 1.21)0.87 (0.65 to 1.17)0.82 (0.51 to 1.32)
 Others1.07 (0.72 to 1.58)1.19 (0.81 to 1.75)1.27 (0.82 to 1.97)
Educational attainment
 Middle school or less1.001.001.00
 High school0.72 (0.56 to 0.94)*0.88 (0.67 to 1.15)0.62 (0.45 to 0.85)*
 College or more0.83 (0.62 to 1.10)0.84 (0.62 to 1.13)0.53 (0.37 to 0.76)*
Household equivalent income†
 Low1.001.001.00
 Middle1.09 (0.86 to 1.38)0.92 (0.73 to 1.17)1.22 (0.90 to 1.65)
 High1.11 (0.88 to 1.39)0.93 (0.74 to 1.18)0.89 (0.65 to 1.23)
Cigarettes per day
 1–101.001.001.00
 11–200.76 (0.63 to 0.92)*0.77 (0.63 to 0.95)*0.92 (0.70 to 1.20)
 21+0.64 (0.48 to 0.85)*0.82 (0.60 to 1.11)1.11 (0.74 to 1.66)
Total home smoking ban
 No1.001.001.00
 Yes1.15 (0.96 to 1.37)1.39 (1.16 to 1.67)*1.63 (1.28 to 2.09)*
Smoking restriction in automobile
 No
1.001.001.00
 Yes1.66 (1.36 to 2.03)*1.66 (1.35 to 2.04)*2.10 (1.57 to 2.81)*
Time-in-sample
 Once1.001.001.00
 Twice1.42 (1.15 to 1.75)*1.44 (1.17 to 1.77)*1.38 (1.05 to 1.82)*
 Thrice0.92 (0.63 to 1.36)1.35 (0.92 to 1.98)1.76 (1.10 to 2.80)*
Survey year
 20081.001.001.00
 20050.57 (0.45 to 0.72)*0.54 (0.42 to 0.70)*0.54 (0.38 to 0.78)*
 20101.04 (0.84 to 1.28)0.92 (0.75 to 1.13)0.93 (0.71 to 1.21)
  • *P value<0.05 from GEE regression.

  • †Low: <30 000 000 won; middle: 30 000 000–44 999 000 won; high: ≥45 000 000 won.

  • GEE, generalised estimating equation.