Demographic and socioeconomic predictors of PBCs and MBCs as a regular brand compared with discount brand cigarettes (DBC)
| Explanatory variables | n | % n (raw) | Premium brand cigarette (PBC) smoker | Mid-priced brand cigarette (MBC) smoker | ||
| OR (95% CI) | P values | OR (95% CI) | P values | |||
| Intercept | 0.01 (0.00 to 0.02) | <0.001 | 0.14 (0.07 to 0.26) | <0.001 | ||
| Survey waves | ||||||
| Wave 1 | 3452 | 19.1 | Reference | Reference | ||
| Wave 2 | 3586 | 19.9 | 1.50 (0.87 to 2.58) | 0.1 | 1.39 (1.09 to 1.78) | 0.009 |
| Wave 3 | 4172 | 23.1 | 2.89 (1.91 to 4.37) | <0.001 | 1.68 (1.27 to 2.22) | <0.001 |
| Wave 4 | 4070 | 22.5 | 16.10 (9.85 to 26.32) | <0.001 | 4.47 (3.10 to 6.44) | <0.001 |
| Wave 5 | 2775 | 15.4 | 51.66 (29.34 to 90.95) | <0.001 | 7.01 (4.28 to 11.46) | <0.001 |
| Age group | ||||||
| 18–24 | 246 | 1.4 | 5.41 (2.24 to 13.03) | <0.001 | 3.26 (1.52 to 7.03) | 0.003 |
| 25–39 | 3191 | 17.7 | 7.94 (5.44 to 11.60) | <0.001 | 3.56 (2.89 to 4.38) | <0.001 |
| 40–54 | 8474 | 47.0 | 2.66 (1.96 to 3.61) | <0.001 | 1.79 (1.51 to 2.12) | <0.001 |
| 55+ | 6137 | 34 | Reference | Reference | ||
| Sex | ||||||
| Male | 17 196 | 95.24 | 2.07 (1.03 to 4.17) | 0.041 | 1.34 (0.97 to 1.84) | 0.076 |
| Female | 859 | 4.76 | Reference | Reference | ||
| City | ||||||
| Beijing | 2763 | 15.3 | Reference | Reference | ||
| Shenyang | 2653 | 14.7 | 1.19 (0.65 to 2.20) | 0.567 | 1.73 (1.05 to 2.84) | 0.032 |
| Shanghai | 3446 | 19.1 | 20.41 (11.71 to 35.57) | <0.001 | 17.80 (11.54 to 27.46) | <0.001 |
| Changsha | 2698 | 14.9 | 0.82 (0.42 to 1.60) | 0.564 | 0.51 (0.30 to 0.86) | 0.012 |
| Guangzhou | 2056 | 11.4 | 0.74 (0.35 to 1.56) | 0.429 | 2.74 (1.49 to 5.05) | 0.002 |
| Kunming | 2066 | 11.4 | 14.65 (6.94 to 30.90) | <0.001 | 7.89 (4.59 to 13.54) | <0.001 |
| Yinchuan | 2373 | 13.1 | 2.85 (1.40 to 5.80) | 0.004 | 2.38 (1.54 to 3.67) | <0.001 |
| Time in sample | ||||||
| 1 | 7802 | 43.2 | 1.67 (0.89 to 3.13) | 0.111 | 1.30 (0.69 to 2.43) | 0.414 |
| 2 | 4940 | 27.4 | 1.35 (0.68 to 2.69) | 0.391 | 1.21 (0.64 to 2.27) | 0.558 |
| 3 | 2988 | 16.6 | 1.11 (0.66 to 1.85) | 0.694 | 1.19 (0.69 to 2.04) | 0.522 |
| 4 | 1631 | 9.0 | 1.06 (0.65 to 1.72) | 0.821 | 0.91 (0.60 to 1.39) | 0.671 |
| 5 | 694 | 3.8 | Reference | Reference | ||
| Smoking status | ||||||
| Daily | 17 156 | 95.0 | 0.29 (0.20 to 0.43) | <0.001 | 0.65 (0.48 to 0.89) | 0.007 |
| Weekly | 898 | 5.0 | Reference | Reference | ||
| Affordability | 6.52 (4.25 to 10.00) | <0.001 | 1.62 (1.11 to 2.36) | 0.012 | ||
The variables in the model are presented in table 4b.