Table 3 Subgroup analysis of the associations between adolescents’ dietary knowledge score and BMI and overweight/obesity: CHNS (2004–2015)
Variables | BMI as a categorical variable | BMI as a continuous variable | P for interaction | |||||
|---|---|---|---|---|---|---|---|---|
Adolescents’ dietary knowledge score ((OR (95%CI)) | P for interaction | Adolescents’ dietary knowledge score (β (95%CI)) | ||||||
Low | Medium | High | Low | Medium | High | |||
Sex | 0.42 | 0.83 | ||||||
Boys | 1.00 | 0.69 (0.41–1.15) | 0.50 (0.29–0.87) | 0.00 | -0.12 (-0.57–0.31) | -0.02(-0.40–0.44) | ||
Girls | 1.00 | 0.65 (0.33–1.30) | 0.77 (0.40–1.49) | 0.00 | 0.06(-0.50–0.37) | -0.05 (-0.47–0.36) | ||
Residence | 0.45 | 0.20 | ||||||
Rural | 1.00 | 0.66 (0.40–1.11) | 0.72 (0.43–1.23) | 0.00 | 0.08 (-0.30–0.45) | 0.14 (-0.22–0.50) | ||
Urban | 1.00 | 0.64 (0.32–1.28) | 0.42 (0.20–0.87) | 0.00 | -0.60 (-1.14–-0.06) | -0.45 (-0.98–0.07) | ||
Family income | 0.56 | 0.20 | ||||||
Low | 1.00 | 0.82 (0.26–2.60) | 1.38 (0.42–4.51) | 0.00 | 0.61 (0.01–1.21) | 0.62 (0.03–1.23) | ||
Medium | 1.00 | 0.42 (0.20–0.90) | 0.35 (0.16–0.76) | 0.00 | -0.31 (-0.76–0.15) | -0.20 (-0.63–0.22) | ||
High | 1.00 | 0.84 (0.48–1.48) | 0.68 (0.38–1.21) | 0.00 | -0.02 (-0.58–0.56) | -0.19 (-0.73–0.35) | ||
Adolescents’ education | 0.46 | 0.04* | ||||||
Low | 1.00 | 0.22 (0.07–0.69) | 0.18 (0.06–0.58) | 0.00 | -0.26 (-1.19–0.66) | 0.00 (-0.86–0.85) | ||
Medium | 1.00 | 0.90 (0.53–1.54) | 0.90 (0.52–1.55) | 0.00 | 0.09 (-0.30–0.48) | 0.10 (-0.27–0.48) | ||
High | 1.00 | 0.58 (0.23–1.44) | 0.38 (0.15–0.98) | 0.00 | -0.81 (-1.56–--0.05) | -1.05 (-1.78–-0.33) | ||