Asthma definitions and individual risk factors
| Variables | Definitions | Categories | N (%) |
| Wheeze ever | Children who have ever had wheezing in life | No | 1229 (66.7) |
| Yes | 614 (33.3) | ||
| Missing | 0 | ||
| Current wheeze | Children who presented wheeze in the last 12 months | No | 1603 (87) |
| Yes | 240 (13) | ||
| Missing | 2 (0.01) | ||
| Doctor diagnosis of asthma | Children who were diagnosed of asthma by a doctor | No | 1715 (92.4) |
| Yes | 128 (6.9) | ||
| Missing | 12 (0.07) | ||
| Sex | Sex of the children | Female | 900 (48.8) |
| Male | 943 (51.2) | ||
| Missing | 0 | ||
| Maternal asthma | Children who have mothers with history of asthma | No | 1698 (92.1) |
| Yes | 122 (6.6) | ||
| Missing | 23 (1.2) | ||
| Environmental tabaco Smoke | Smoking habit at home in the last 2 years by any of the family members | No | 1599 (86.8) |
| Yes | 242 (13.1) | ||
| Missing | 2 (0.1) | ||
| Household overcrowding | Children living in houses with more than three people per bedroom | No | 1369 (78.6) |
| Yes | 372 (21.4) | ||
| Missing | 102 (5.5%) | ||
| Dog at home | Children living in households with dogs inside the hose | No | 1031 (55.9) |
| Yes | 812 (44.1) | ||
| Missing | 0 | ||
| Farm animals | Children living in households with farm animals around the hose | No | 565 (30.7) |
| Yes | 1277 (69.3) | ||
| Missing | 1 (0.1) | ||
| Bronchitis | Children who were diagnosed of bronchitis by a doctor | No | 1559 (84.6) |
| Yes | 270 (14.7) | ||
| Missing | 14 (0.8) | ||
| Bronchopneumonia | Children who were diagnosed of bronchopneumonia by a doctor | No | 1694 (92.8) |
| Yes | 131 (7.2) | ||
| Missing | 18 (1) | ||
| Atopy | Children who tested positive to skin prick test for | No | 1571 (85.2) |
| Yes | 256 (13.9) | ||
| Missing | 16 (0.09) |