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Table 2 Respiratory symptoms in relation to residential coal burning

From: Respiratory symptoms in relation to residential coal burning and environmental tobacco smoke among early adolescents in Wuhan, China: a cross-sectional study

  Cough with colds Cough without colds
  No Yes    No Yes   
Exposure N N OR* (95% CI) N N OR* (95% CI)
Total 3413 1117    4327 203   
Coal use         
   No 1833 622 1.00   2347 108 1.00  
   Yes 1580 495 0.92 (0.76,1.11) 1980 95 1.03 (0.80,1.33)
Heating 300 99 0.96 (0.76,1.22) 381 18 1.02 (0.67,1.55)
Cooking 926 249 0.79 (0.67,0.94) 1120 55 1.04 (0.74,1.46)
Both 354 147 1.22 (0.93,1.59) 479 22 0.99 (0.66,1.49)
  Phlegm with colds Phlegm without colds
  No Yes    No Yes   
  N N OR* (95% CI) N N OR* (95% CI)
Total 3772 758    4274 256   
Coal use         
   No 2051 404 1.00   2315 140 1.00  
   Yes 1721 354 1.04 (0.90,1.20) 1959 116 0.96 (0.75,1.23)
Heating 331 68 1.04 (0.86,1.27) 376 23 1.02 (0.62,1.66)
Cooking 994 181 0.92 (0.76,1.10) 1114 61 0.86 (0.64,1.16)
Both 396 105 1.34 (1.05,1.73) 469 32 1.12 (0.81,1.54)
  Wheeze with colds Wheeze without colds
  No Yes    No Yes   
  N N OR* (95% CI) N N OR* (95% CI)
Total 3652 878    4210 320   
Coal use         
   No 2058 397 1.00   2309 146 1.00  
   Yes 1594 481 1.57 (1.07,2.29) 1901 174 1.44 (1.05,1.97)
Heating 329 70 1.10 (0.76,1.57) 368 31 1.35 (0.86,2.15)
Cooking 892 283 1.66 (1.01,2.73) 1077 98 1.42 (1.05,1.92)
Both 373 128 1.78 (1.08,2.91) 456 45 1.57 (0.94,2.64)
  1. * Odds ratios (OR) adjusted for gender, ETS, and school district. Dichotomous and multilevel odds ratios are computed in separate models.