| First author [ref.] | Asthma definition | Exposure metric | Co-exposures | OR (95% CI) |
| Salam [25] | Doctor-diagnosed asthma | Self-reported farm-related exposures to crops, dusts, animals, herbicides and pesticides in first year of life | Crops, dusts, animals | 2.39 (1.17–4.89) |
| Salameh [26] | Self-reported, doctor-diagnosed asthma | Any exposure to pesticides | Dust, animals | 1.73 (1.02–2.96) |
| Sunyer [27] | Doctor-diagnosed asthma at age 4 years | Cord blood and blood samples | Unknown | 1.46# (0.92–2.32) |
| Sunyer [28] | Doctor-diagnosed asthma at age 6.5 years | Cord blood and blood samples aged 4 years | Unknown | 1.18 (1.01–1.39) |
| Weselak [29] | Self-reported, doctor-diagnosed asthma | Any exposure to pesticides during pregnancy | Farm environment | 1.00 (0.71–1.40) |
#: risk ratio.