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Table 1. Prevalence of COPD and its smoking association in various population studies from India.
| Population | COPD prevalence (%) | Smoker: NonSmoker Ratio |
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| Men | Women | M:F Ration | |||
| Wig (1964)6 | Rural Delhi | 3.36 | 2.54 | 1.3 | 2.0 |
| Sikand (1966)7 | Delhi | 7.0 | 4.3 | 1.6 | 2.5 |
| Viswanathan (1966)8 | Patna | 2.12 | 1.33 | 1.6 | |
| Bhattacharya (1975)9 | Rural U.P | 6.67 | 4.48 | 1.6 | |
| Radha (1977)10 | New Delhi | 8.1 | 4.6 | 1.8 | 1.8 |
| Thiruvengadam (1977)11 | Madras | 1.9 | 1.2 | 1.6 | 10.2 |
| Viswanathan (1977)12 | Delhi Rural | 4.7 | 3.5 | 1.3 | 9.6 |
| Urban | 8.0 | 4.3 | 1.9 | 4.0 | |
| Charan (1977)13 | Rural Punjab | 2.28 | 1.63 | 1.4 | |
| Malik (1986)14 | N.India Rural | 9.4 | 4.9 | 1.9 | 5.5 |
| Urban | 3.7 | 1.6 | 2.3 | 7.0 | |
| Jindal (1993)15 | N.India Rural | 6.2 | 3.9 | 1.6 | |
| Urban | 4.2 | 1.6 | 2.6 | 9.6 | |
| Ray (1995)16 | South India | 4.08 | 2.55 | 1.6 | 1.6 |