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Table 2 Baseline characteristics by secondhand smoke exposure from the SCHEDULE study in China

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

Secondhand smoke exposure/daily, %a
Characteristics None < 1 h 1–2 h ≥3 h p value
  N (%) 20.8 63.1 10.5 5.6  
Sex 0.968
 Boys 9242 (53.8) 53.8 53.4 53.6 54.0  
 Girls 7943 (46.2) 46.2 46.6 46.4 46.0  
Age (Mean score)   9.1 9.2 9.2 9.2 0.55
Household income < 0.001
 ≤30,000 1564 (13.1) 9.1 13.4 16.1 13.3  
 30,000-100,000 5306 (44.5) 35.2 46.6 48.4 44.7  
 100,000-300,000 4190 (35.1) 42 34.3 30.6 35.2  
 ≥300,000 864 (7.3) 13.7 5.7 4.9 6.8  
Maternal education < 0.001
 Middle school or below 5594 (34.0) 24.9 36.3 37.1 29.3  
 High school 4386 (26.7) 22.1 27.4 30.5 30.1  
 College or above 6467 (39.3) 53.0 36.4 32.4 40.6  
Paternal education < 0.001
 Middle school or below 4834 (29.1) 19.4 31.1 34.5 25.8  
 High school 5005 (30.2) 23.3 31.8 33.7 34.1  
 College or above 6743 (40.7) 57.3 37.1 31.8 40.1  
Mode of birth 0.06
 Vaginal 8012 (50.2) 48.8 50.3 52.5 48.4  
 Cesarean 7933 (49.8) 51.2 49.7 47.5 51.6  
Place of birth < 0.001
 Shanghai 8096 (52.2) 48.8 52.9 55.0 57.4  
 Others 7402 (47.8) 51.2 47.1 45.0 42.6  
BMI z-score (Mean score)   0.21 0.30 0.30 0.38 0.01
  1. a Given as % unless indicated