Characteristics of the World Health Survey population# and distribution of asthma
| Sex | |
| Female | 157152 (52.2) |
| Male | 125005 (47.8) |
| Age yrs | |
| 18–29 | 81389 (25.8) |
| 30–49 | 118505 (39.9) |
| >50 | 82480 (34.3) |
| Smoking status | |
| Current | 61558 (29.9) |
| Non-smoker | 194185 (70.1) |
| Household setting | |
| Mostly urban | 175793 (29.7) |
| Mostly rural | 132123 (70.3) |
| Income inequality: Gini coefficient | |
| Low Gini | 173294 (55.4) |
| High Gini | 132762 (44.6) |
| GNI PPP stratum | |
| Low | 113169 (34.7) |
| Middle | 90305 (44.4) |
| High | 104442 (20.8) |
| Respiratory outcome | |
| Current wheezing symptoms | 25617 (9.2) |
| Diagnosed asthma | 14723 (6.0) |
Data are presented as unweighted frequency n (weighted %). GNI PPP: per capita gross national income adjusted for purchasing power parity. Gini coefficient is a measure of household income inequality within a country [21, 22]. #: includes only the complete records for males and females, missing records have not been included.