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Table 2 Rate ratios of DMFT for 12–17 year olds and TV viewing, by age, sex, ethnicity and diet

From: The association between dental caries and television viewing among Chinese adolescents in Guangxi, China

 

Model 1

Model 2

Rate ratio

Rate ratio

Age (reference: 12 years)

Age 14 years

1.15* (1.02, 1.30)

1.14* (1.01, 1.29)

 

Age 17 years

1.43*** (1.27, 1.62)

1.43*** (1.27, 1.62)

Sex (female)

1.45*** (1.31, 1.60)

1.46*** (1.32, 1.61)

City (rural)

1.29*** (1.16, 1.43)

1.27*** (1.14, 1.42)

Ethnicity: (reference: Han)

Ethnicity Zhuang

1.84*** (1.65, 2.04)

1.84*** (1.65, 2.05)

 

Ethnicity Yao

0.36*** (0.30, 0.43)

0.35*** (0.29, 0.42)

TV (reference: <30 minutes/day)

30-60 minutes

1.03 (0.90, 1.17)

1.04 (0.91, 1.18)

 

60-120 minutes

1.22** (1.07, 1.40)

1.23** (1.07, 1.41)

 

120-180 minutes

1.25* (1.04, 1.49)

1.25* (1.05, 1.50)

 

>180 minutes

1.28** (1.06, 1.55)

1.29** (1.07, 1.55)

Drink milk (reference: never)

Sometimes

 

0.90 (0.77, 1.05)

 

Every day

 

0.94 (0.78, 1.15)

 

Twice a day

 

0.87 (0.67, 1.14)

Breakfast (Have breakfast most days)

 

0.96 (0.82, 1.12)

  1. 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.
  2. Model 1: log likelihood chi-square: 415.73, Prob > chi-square:<0.001, Pseudo R-square: 0.0334.
  3. Model 2: log likelihood chi-square: 418.24, Prob > chi-square:<0.001, Pseudo R-square: 0.0336.