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Page 2
Characteristics
Frequency (percentagea)
P-valuec
Birth cohort sample (Years 2006 to 2008)
n = 1565
Deliveries in regionb (Year 2006)
n = 8608
Gender of infant
Male
764 (49.9%)
4462 (51.8%)
0.079
Female
782 (50.1%)
4145 (48.2%)
Missing data
19
0
Maternal age
<20 years
87 (5.7%)
512 (5.9%)
0.239
20-24 years
325 (21.1%)
1608 (18.7%)
25-29 years
424 (27.6%)
2388 (27.7%)
30-34 years
427 (27.8%)
2515 (29.2%)
≥35 years
274 (17.8%)
1584 (18.4%)
Missing data
28
0
Birth weight
<2500 g
39 (2.5%)
450 (5.5%)
<0.0005
2500-3999 g
1266 (81.7%)
7073 (82.2%)
≥4000 g
244 (15.8%)
1060 (12.3%)
Missing data
16
2
Gestational age at birth
<28 weeks
0 (0.0%)
59 (0.7%)
<0.0005
28-36 weeks
38 (2.4%)
536 (6.2%)
37-41 weeks
1505 (97.2%)
7963 (92.5%)
≥42 weeks
6 (0.4%)
45 (0.5%)
Missing data
16
4
Plurality
Singleton
1532 (98.5%)
8388 (97.4%)
0.016
Multiple
24 (1.5%)
220 (2.6%)
Missing data
9
0
Outcome
Live birth
1554 (99.9%)
8547 (99.3%)
0.007
Stillbirth
2 (0.1%)
61 (0.7%)
Missing data
9
0
aPercentages are calculated based on the available (non-missing) data.
bData for the study region (Logan, Gold Coast, Beaudesert, Tweed) are provided by Queensland Health and New South Wales Health.
cChi-square test for comparing proportions between birth cohort sample and the general population.