Characteristic | n (%) | Ever smokers (%) | Model 1* Adjusted OR* (95% CI) | P value | Model 2† Adjusted OR (95% CI) | P value |
Class on health hazards of tobacco | 0.003 | |||||
Yes | 7917 (20.2) | 243 (3.1) | 1 | |||
No | 17 284 (44.0) | 363 (2.1) | 0.8 (0.6 to 0.9) | |||
Not sure | 14 081 (35.8) | 308 (2.2) | 0.7 (0.6 to 0.9) | |||
Participated in antitobacco activity | <0.001 | <0.001 | ||||
Yes | 7675 (19.5) | 288 (3.8) | 1 | 1 | ||
No | 31 607 (80.5) | 626 (2.0) | 0.6 (0.5 to 0.7) | 0.6 (0.5 to 0.7) | ||
Heard or seen antitobacco media messages | <0.001‡ | <0.001‡ | ||||
None | 14 106 (35.9) | 291 (2.1) | 1 | 1 | ||
1–5 | 10 291 (26.2) | 143 (1.4) | 0.7 (0.5 to 0.9) | 0.7 (0.5 to 0.8) | ||
6–10 | 3597 (9.2) | 184 (5.1) | 1.8 (1.4 to 2.4) | 1.7 (1.4 to 2.2) | ||
>10 | 11 288 (28.7) | 296 (2.6) | 1.2 (1.0 to 1.5) | 1.1 (0.9 to 1.4) | ||
Exposure to tobacco advertisements | 0.442 | |||||
Yes | 30 111 (76.7) | 743 (2.5) | 1.1 (0.9 to 1.3) | |||
No | 9171 (23.3) | 171 (1.9) | 1 | |||
Exposure to tobacco interval in movies | <0.001‡ | <0.001‡ | ||||
0 | 584 (1.5) | 7 (1.2) | 1 | 1 | ||
1–48 | 12 079 (30.7) | 363 (3.0) | 1.2 (0.6 to 2.7) | 1.2 (0.5 to 2.6) | ||
49–83 | 13 277 (33.8) | 270 (2.0) | 0.9 (0.4 to 1.9) | 0.9 (0.4 to 1.9) | ||
>83 | 13 342 (34.0) | 274 (2.1) | 0.8 (0.3 to 1.7) | 0.7 (0.3 to 1.6) |
*Model 1. All p<0.05 after adjustment for age, gender, father’s education, family members smoking, friends smoking, wealth quintile, rebelliousness, self-esteem and school performance.
†Model 2. Mutually adjusted with exclusion of non-significant (NS) variables in this table.
‡P value for trend.