|  | Numbers at age 10 (%) | Numbers used in the analysis (%) | χ2 p value |
---|---|---|---|---|
Variable | Total | 1,373 | 791 | Â |
Wheeze Phenotype | Early-onset persistent* | 139 (12.7) | 105 (13.3) | 0.60 |
 | Late-onset persistent†| 81 (7.4) | 70 (8.9) |  |
 | Early transient‡ | 259 (23.6) | 190 (23.9) |  |
 | Non-wheezer§ | 617 (56.3) | 426 (53.9) |  |
 | Missing | 277 | 0 |  |
Birth weight | ≥2500 grams | 1287 (96.3) | 736 (96.0) | 0.75 |
 | <2500 grams | 49 (3.7) | 31 (4.0) |  |
 | Missing | 37 | 24 |  |
Exposure to tobacco smoke | ETS-0 | 617 (45.2) | 381 (48.2) | 0.22 |
 | ETS-1 | 430 (31.5) | 249 (31.5) |  |
 | ETS-2 | 319 (23.3) | 161 (20.3) |  |
 | Missing | 7 | 0 |  |
Gender | Girl Boy | 676 (49.2) | 388 (49.3) | 0.98 |
 |  | 697 (50.8) | 399 (50.7) |  |
Breast fed | ≥3 months | 470 (41.7) | 322 (42.8) | 0.67 |
 | <3 months | 657 (58.3) | 430 (57.2) |  |
 | Missing | 246 | 39 |  |
Household cat during pregnancy | Yes | 453 (33.2) | 269 (34.0) | 0.68 |
 | No | 912 (66.8) | 521 (66.0) |  |
 | Missing | 8 | 1 |  |
Household dog during pregnancy | Yes | 395 (28.9) | 240 (30.4) | 0.48 |
 | No | 970 (71.1) | 550 (69.6) |  |
 | Missing | 8 | 1 |  |