Table 2.
Demographics of the New Zealand Asthma and Allergy Cohort
| Christchurch | Wellington | Total | |
| Total number of children recruited | 552 | 553 | 1105 |
| Total number with 3 month questionnaire data | 535 (96.9%) | 529 (95.7%) | 1064 (96.3%) |
| Total number with 15 month questionnaire data | 505 (91.4%) | 506 (91.5%) | 1011 (91.4%) |
| Male:Female (ratio %) | 283:269 (51.3:48.7) | 278:275 (50.3:49.7) | 561:544 (50.8:49.2) |
| First born | 41.3% | 50.5% | 45.9% |
| Second born | 37.0% | 34.0% | 35.5% |
| Third + born | 21.7% | 15.6% | 18.6% |
| Number of multiple births | 10 | 2 | 12 |
| Gestation: Mean (range) | 39.6 (33.0–43.0) | 39.6 (32.0–43.0) | 39.6 (32.0–43.0) |
| Maternal age at birth: Mean (range) | 29.9 (16.3–46.7) | 30.3 (15.5–45.6) | 30.1 (15.5–46.7) |
| Percentage Maori Children† * | 11.6% | 18.9% | 15.2% |
| Percentage with Maori Mother * | 5.6% | 9.4% | 7.5% |
| Family history† § n = 1046 | 85.2% | 82.9% | 84.0% |
| Smoking during pregnancy † | 21.1% | 20.8% | 21.0% |
| Household smoking † | 33.6% | 31.8% | 32.7% |
| Cord blood obtained | 91.7% | 87.5% | 89.6% |
† Collected at age 3 months
* Maori has been defined to include both sole Maori and Maori plus other ethnicity, using questions derived from the 1996 New Zealand Census.
§Family history has been defined to include either parent with asthma, hayfever or eczema. Fathers not living with the child were not asked this question