Distributions of potential confounding variables by outcome. Unless otherwise stated, figures are numbers (percentages)
| N | Positive skin test dust mite | p value | Positive skin test cat fur | p value | Atopic wheeze | p value | |
|---|---|---|---|---|---|---|---|
| *Socioeconomic class (I/II professional and managerial, III–V manual). | |||||||
| Maternal atopy | |||||||
| No | 367 | 31 (8.5) | 0.188 | 29 (7.9) | 0.462 | 22 (6.0) | 0.161 |
| Yes | 184 | 22 (12.0) | 18 (9.8) | 17 (9.2) | |||
| Paternal atopy | |||||||
| No | 294 | 18 (6.1) | 0.001 | 20 (6.8) | 0.060 | 13 (4.4) | 0.003 |
| Yes | 207 | 32 (15.5) | 24 (11.7) | 24 (11.6) | |||
| Maternal asthma | |||||||
| No | 477 | 42 (8.8) | 0.109 | 37 (7.8) | 0.109 | 29 (6.1) | 0.023 |
| Yes | 75 | 11 (14.7) | 10 (13.3) | 10 (13.3) | |||
| Paternal asthma | |||||||
| No | 472 | 43 (9.1) | 0.268 | 39 (8.3) | 0.490 | 28 (5.9) | 0.007 |
| Yes | 76 | 10 (13.2) | 8 (10.7) | 11 (14.5) | |||
| Socioeconomic class* | |||||||
| I/II | 146 | 17 (11.6) | 0.384 | 19 (13.0) | 0.018 | 13 (8.9) | 0.188 |
| III–V | 352 | 32 (9.1) | 23 (6.6) | 20 (5.7) | |||
| First born | |||||||
| No | 318 | 23 (7.2) | 0.028 | 20 (6.3) | 0.028 | 15 (4.7) | 0.012 |
| Yes | 234 | 30 (12.8) | 27 (11.6) | 24 (10.3) | |||
| Pet cat by age 1 | |||||||
| No | 370 | 39 (10.5) | 0.286 | 34 (9.2) | 0.413 | 25 (6.8) | 0.687 |
| Yes | 182 | 14 (7.7) | 13 (7.1) | 14 (7.7) | |||
| Pet dog by age 1 | |||||||
| No | 398 | 40 (10.1) | 0.565 | 36 (9.1) | 0.468 | 29 (7.3) | 0.744 |
| Yes | 154 | 13 (8.4) | 11 (7.1) | 10 (6.5) | |||
| Breast feeding | |||||||
| No | 205 | 14 (6.8) | 0.089 | 16 (7.8) | 0.639 | 10 (4.9) | 0.123 |
| Yes | 347 | 39 (11.2) | 31 (9.0) | 29 (8.4) | |||
| Anyone smoking in the home at age 1 | |||||||
| No | 317 | 25 (7.9) | 0.112 | 25 (7.9) | 0.547 | 16 (5.1) | 0.032 |
| Yes | 235 | 28 (11.9) | 22 (9.4) | 23 (9.8) | |||