| Characteristic | Atopic by 2 yrs | p-value | Atopic after 2 yrs | p-value |
| Subjects n | 69 | 22 | ||
| Whole population regardless of ARI history | 2.35 (1.13–4.90) | 0.022 | 1.22 (0.52–2.86) | 0.652 |
| Infections in first year | ||||
| Any febrile infections | 2.29 (1.20–4.40) | 0.012 | 2.12 (0.83–5.38) | 0.115 |
| Any febrile URI | 1.11 (0.50–2.49) | 0.795 | 2.58 (1.04–6.43) | 0.041 |
| Any LRI with fever | 3.51 (1.83–6.70) | <0.001 | 1.13 (0.17–7.63) | 0.903 |
| Any LRI without fever | 2.11 (1.11–3.99) | 0.022 | 1.44 (0.52–3.99) | 0.481 |
| Any wheezy or febrile LRI | 2.64 (1.39–5.02) | 0.003 | 0.67 (0.10–4.54) | 0.685 |
| Any wheezy LRI | 1.60 (0.73–3.47) | 0.238 | 1.74 (0.46–6.58) | 0.412 |
| Any wheezy LRI with fever | 2.05 (0.88–4.79) | 0.096 | 2.31 (0.32–16.73) | 0.406 |
| Any wheezy LRI without fever | 1.81 (0.84–3.86) | 0.128 | 1.43 (0.24–8.51) | 0.696 |
| Any wheezy LRI associated with HRV or RSV | 2.03 (0.97–4.27) | 0.061 | 2.38 (0.70–8.11) | 0.166 |
| Any wheezy LRI associated with HRV | 2.03 (0.97–4.27) | 0.061 | 3.46 (1.01–11.82) | 0.048 |
| Any wheezy LRI associated with RSV | 2.80 (0.93–8.46) | 0.068 | 0 |
Data are presented as risk ratio (95% CI), unless otherwise stated. ARI: acute respiratory illnesses; URI: upper respiratory illness; LRI: lower respiratory illness; HRV: human rhinoviruses; RSV: respiratory syncytial virus. #: adjusted for sex, breastfeeding, pet ownership, older siblings, second-hand tobacco smoke exposure and daycare attendance. Bold indicates statistical significance.