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Table 2 Demographics of the New Zealand Asthma and Allergy Cohort

From: The New Zealand Asthma and Allergy Cohort Study (NZA2CS): Assembly, Demographics and Investigations

  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%
  1. † Collected at age 3 months
  2. * Maori has been defined to include both sole Maori and Maori plus other ethnicity, using questions derived from the 1996 New Zealand Census.
  3. §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