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Table 2 Prevalence of respiratory symptoms and asthma with reference to ETS exposure at home

From: Pulmonary effects of passive smoking: the Indian experience

  Exposed (n = 2574) Unexposed (n = 6516) Crude O.R. (95% C.I.) * Age and sex adjusted O.R. (95% C.I.) *
Asthma (questionnaire diagnosis) 84 (3.3%) 121 (1.9%) 1.783 (1.345–2.364) 1.780 (1.340–2.364)
Symptoms     
   Wheeze 226 (8.8%) 364 (5.6%) 1.627 (1.369–1.933) 1.605 (1.349–1.910)
   Chest tightness 220 (8.5%) 345 (5.3%) 1.671 (1.402–1.992) 1.690 (1.417–2.017)
   Dyspnea on exertion 425 (16.5%) 676 (10.4%) 1.708 (1.499–1.948) 1.689 (1.481–1.927)
   Dyspnea at rest 129 (5.0%) 207 (3.2%) 1.608 (1.284–2.013) 1.671 (1.333–2.095)
   Dyspnea at night 134 (5.2%) 205 (3.1%) 1.690 (1.353–2.112) 1.702 (1.360–2.129)
   Cough at night 355 (13.8%) 556 (8.5%) 1.715 (1.488–1.976) 1.754 (1.521–2.023)
   Cough in morning 210 (8.2%) 308 (4.7%) 1.790 (1.493–2.047) 1.763 (1.469–2.117)
   Phlegm in morning 384 (14.9%) 586 (9.0%) 1.773 (1.545–2.035) 1.761 (1.533–2.023)
   Phlegm for >3 months 152 (6.7%) 224 (4.0%) 1.698 (1.374–2.099) 1.719 (1.388–2.129)
   Chest tightness on exposure to allergens 425 (16.5%) 526 (8.1%) 2.252 (1.964–2.583) 2.245 (1.956–2.577)
   Dyspnea on exposure to allergens 432 (16.8%) 658 (10.1%) 1.796 (1.575–2.047) 1.881 (1.648–2.147)
  1. * Odds ratio and 95% confidence interval (Reproduced with permission from reference 25).