Table 3.
Rate ratio of decayed permanent teeth in 12–17 year olds and TV, by age, sex, ethnicity and diet
| Model 1 | Model 2 | ||
|---|---|---|---|
| Rate ratio | Rate ratio | ||
| Age (reference: 12 years) | Age 14 years | 1.11 (0.98, 1.27) | 1.09 (0.96, 1.24) |
| Age 17 years | 1.28*** (1.12, 1.45) | 1.27*** (1.12, 1.45) | |
| Sex (female) | 1.40*** (1.26, 1.56) | 1.42*** (1.28, 1.57) | |
| City (rural) | 1.49*** (1.33, 1.66) | 1.47*** (1.31, 1.65) | |
| Ethnicity: (reference: Han) | Ethnicity Zhuang | 1.61*** (1.44, 1.80) | 1.60*** (1.43, 1.78) |
| Ethnicity Yao | 0.32*** (0.27, 0.39) | 0.31*** (0.26, 0.38) | |
| TV (reference: <30 minutes/day) | 30-60 minutes | 1.04 (0.90, 1.19) | 1.04 (0.91, 1.20) |
| 60-120 minutes | 1.24** (1.07, 1.43) | 1.24** (1.07, 1.43) | |
| 120-180 minutes | 1.26* (1.04, 1.52) | 1.26* (1.04, 1.52) | |
| >180 minutes | 1.26* (1.04, 1.54) | 1.26* (1.04, 1.54) | |
| Drink milk (reference: never) | Sometimes | 0.91 (0.77, 1.07) | |
| Every day | 0.94 (0.77, 1.17) | ||
| Twice a day | 0.84 (0.64, 1.12) | ||
| Breakfast (Have breakfast most days) | 0.87 (0.75, 1.03) | ||
Model 1 adjusted for age, sex, area of residence (rural/ urban), Ethnicity, TV viewing. Model 2 additionally adjusted for eating breakfast regularly, and frequency of drinking milk. *** p < 0.001, ** p < 0.01, * p < 0.05.
For Model 1: log likelihood chi-square: 334.19, Prob > chi-square:<0.001, Pseudo R-square: 0.0289.
For Model 2: log likelihood chi-square: 338.70, Prob > chi-square:<0.001, Pseudo R-square: 0.0293.