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Table 3 Adjusted associations of secondhand smoke exposure with psychological symptoms using multiple imputation in the SCHEDULE study in China

From: The association between exposure to secondhand smoke and psychological symptoms among Chinese children

  Secondhand smoke exposure
None < 1 h/daily 1–2 h/daily ≥3 h/daily
Reference OR (95% CI) OR (95% CI) OR (95% CI)
Model 1
 Total SDQ score 1 1.60 (1.38 to 1.86) 2.44 (2.02 to 2.96) 2.75 (2.20 to 3.43)
 Emotional symptoms 1 1.49 (1.26 to 1.76) 1.98 (1.59 to 2.48) 2.16 (1.66 to 2.81)
 Conduct problems 1 1.46 (1.24 to 1.72) 2.03 (1.64 to 2.52) 2.20 (1.71 to 2.83)
 Hyperactivity-inattention 1 1.37 (1.22 to 1.53) 1.79 (1.53 to 2.09) 2.14 (1.79 to 2.57)
 Peer relationship problems 1 1.46 (1.33 to 1.61) 1.70 (1.48 to 1.94) 1.52 (1.29 to 1.80)
 Prosocial behaviors 1 1.17 (0.99 to 1.38) 1.34 (1.06 to 1.68) 1.46 (1.11 to 1.91)
Model 2
 Total SDQ score 1 1.42 (1.22 to 1.66) 2.14 (1.76 to 2.62) 2.53 (2.01 to 3.18)
 Emotional symptoms 1 1.38 (1.16 to 1.64) 1.84 (1.46 to 2.31) 2.05 (1.57 to 2.68)
 Conduct problems 1 1.36 (1.15 to 1.61) 1.88 (1.50 to 2.34) 2.09 (1.61 to 2.70)
 Hyperactivity-inattention 1 1.24 (1.10 to 1.39) 1.58 (1.35 to 1.86) 1.98 (1.65 to 2.38)
 Peer relationship problems 1 1.25 (1.13 to 1.38) 1.41 (1.23 to 1.63) 1.36 (1.14 to 1.61)
 Prosocial behaviors 1 1.06 (0.90 to 1.26) 1.14 (0.89 to 1.44) 1.37 (1.03 to 1.82)
  1. Model 1 adjusted for sex, age at measurement;
  2. Model 2 additionally adjusted for parents’ education, household income, mode of birth, place of birth and BMI z-score (relative to the 2007 World Health Organization growth reference)