Table 1.
Maternal and infant characteristics of the population
| All births (N = 599,191)a |
Births that linked to CDIS dataset (N = 105,599)a | |
|---|---|---|
| N (%) | N (%) | |
| Parity | ||
| Primiparous | 269,018 (44.9) | 48,526 (46.0) |
| Multiparous | 330,132 (55.1) | 57,073 (54.0) |
| Sex of Baby | ||
| Male | 306,177 (51.1) | 54,184 (51.3) |
| Female | 292,821 (48.9) | 51,415 (48.7) |
| Admission Type | ||
| Public hospital | 444,742 (74.2) | 74,781 (70.8) |
| Private hospital | 154,449 (25.8) | 30,797 (29.2) |
| Maternal Age Group | ||
| < 25 years | 69,222 (11.6) | 9301 (8.8) |
| 25–29 years | 157,697 (26.3) | 26,426 (25.0) |
| 30–34 years | 220,975 (36.9) | 41,845 (39.6) |
| 35–39 years | 123,308 (20.6) | 23,124 (21.9) |
| 40 years or older | 27,800 (4.6) | 4903 (4.6) |
| BMI | ||
| Mean (SD) | 25.78 (5.79) | 25.58 (5.62) |
| Marital Status | ||
| Married | 424,745 (71.8) | NA |
| De facto | 102,758 (17.4) | NA |
| Single | 63,944 (10.8) | NA |
| Gestation (completed weeks) | ||
| 37 | 48,828 (4.1) | 9161 (8.7) |
| 38 | 138,038 (23.0) | 25,157 (23.8) |
| 39 | 175,726 (29.3) | 32,090 (30.4) |
| 40 | 156,018 (26.0) | 27,201 (25.8) |
| 41 | 76,262 (12.7) | 11,561 (10.9) |
| 42 or more | 4319 (0.7) | 425 (0.4) |
| SEIFA quintile | ||
| 1 (most disadvantaged) | 109,356 (19.5) | 17,513 (16.7) |
| 2 | 111,313 (19.8) | 20,151 (19.3) |
| 3 | 113,055 (20.1) | 21,927 (21.0) |
| 4 | 113,558 (20.2) | 21,824 (20.9) |
| 5 (least disadvantaged) | 114,685 (20.4) | 23,206 (22.2) |
| Smoking status during pregnancy | ||
| Yes | 53,029 (9.2) | 7038 (7.0) |
| Country of Birth Region | ||
| Australia | 378,658 (63.6) | 69,426 (66.1) |
| Oceania and Antarctica | 16,610 (2.8) | 2258 (2.1) |
| Americas | 8338 (1.4) | 1244 (1.2) |
| South-East Asia | 38,698 (6.5) | 6148 (5.8) |
| Southern and Central Asia | 60,621 (10.2) | 9827 (9.3) |
| North-East Asia | 29,507 (5.0) | 6220 (5.9) |
| North-West Europe | 17,760 (3.0) | 3280 (3.1) |
| Southern and Eastern Europe | 11,524 (1.9) | 1676 (1.6) |
| North Africa and the Middle East | 20,718 (3.5) | 3125 (3.0) |
| Sub-Saharan Africa | 13,076 (2.2) | 1906 (1.8) |
Abbreviation: BMI body mass index, SEIFA Socio-Economic Indexes for Areas, NA not available
aMissing values are excluded from the denominator