Table 1. Maternal and pregnancy characteristics (at the first birth) of women receiving and not receiving a transfusion.
| Variable | +RBCb –PPHc* | +RBC+ PPH | -RBC + PPH | - RBC—PPH |
|---|---|---|---|---|
| % (95% CI) | % (95% CI) | % (95% CI) | % (95% CI) | |
| Total (N) | 949 | 4176 | 27313 | 325946 |
| Maternal Age | ||||
| Under 20 | 11.0 (9.0, 12.9) |
8.7 (7.8, 9.5) |
6.7 (6.4, 7.0) |
7.2 (7.1, 7.2) |
| 20–34 | 72.8 (70.0, 75.6) |
77.2 (75.9, 78.5) |
79.7 (79.3, 80.2) |
78.4 (78.3, 78.6) |
| 35+ | 16.2 (13.9, 18.6) |
14.1 (13.1, 15.2) |
13.6 (13.2, 14.0) |
14.4 (14.3, 14.5) |
| Private Insurance | 28.1 (25.3, 31.0) |
24.2 (22.9, 25.5) |
25.9 (25.4, 26.4) |
37.8 (37.7, 38.0) |
| Smoker | 11.3 (9.3, 13.3) |
8.7 (7.9, 9.6) |
8.6 (8.3, 9.0) |
10.3 (10.2, 10.4) |
| ARTa use | 7.0 (5.3, 8.6) |
4.8 (4.2, 5.5) |
4.0 (3.8, 4.2) |
4.4 (4.3, 4.5) |
| Pregnancy hypertension | 18.3 (15.9, 20.8) |
16.3 (15.1, 17.4) |
12.4 (12.0, 12.8) |
10.8 (10.6, 10.9) |
| Chronic hypertension | 1.7 (0.9, 2.5) |
1.1 (0.8, 1.4) |
1.0 (0.8, 1.1) |
0.8 (0.8, 0.9) |
| Gestational diabetes | 6.3 (4.8, 7.9) |
6.5 (5.8, 7.3) |
6.3 (6.0, 6.6) |
6.0 (5.9, 6.0) |
| Pre-existing diabetes | 0.9 (0.3, 1.6) |
0.3 (0.1, 0.4) |
0.4 (0.3, 0.4) |
0.4 (0.4, 0.5) |
| Chronic conditions | 8.1 (6.4, 9.9) |
3.8 (3.2, 4.4) |
2.9 (2.7, 3.1) |
2.6 (2.5, 2.7) |
| Severe maternal morbidity | 14.1 (11.9, 16.3) |
8.9 (8.0, 9.8) |
1.2 (1.0, 1.3) |
0.4 (0.4, 0.4) |
| Gestational Age | ||||
| 20–32 weeks | 5.6 (4.1, 7.0) |
1.3 (1.0, 1.7) |
1.0 (0.9, 1.1) |
1.1 (1.1, 1.1) |
| 33–36 weeks | 11.4 (9.4, 13.4) |
4.2 (3.6, 4.8) |
3.6 (3.4, 3.8) |
4.9 (4.8, 4.9) |
| 37+ weeks | 83.0 (80.6, 85.4) |
94.4 (93.7, 95.1) |
95.4 (95.1, 95.6) |
94.0 (93.9, 94.1) |
| Mode of birth | ||||
| Normal vaginal delivery | 16.8 (14.4, 19.1) |
41.6 (40.1, 43.1) |
48.7 (48.1, 49.3) |
47.9 (47.7, 48.0) |
| Pre-labour Caesarean | 24.3 (21.6, 27.1) |
5.0 (4.3, 5.6) |
4.8 (4.5, 5.0) |
11.3 (11.2, 11.4) |
| Intrapartum Caesarean | 32.9 (29.9, 35.9) |
14.8 (13.7, 15.9) |
13.8 (13.4, 14.3) |
20.4 (20.3, 20.6) |
| Instrumental delivery | 25.4 (22.6, 28.2) |
36.6 (35.1, 38.1) |
31.3 (30.7, 31.8) |
19.9 (19.8, 20.0) |
| Induction of labour | 34.4 (31.3, 37.4) |
42.7 (41.2, 44.2) |
39.5 (38.9, 40.0) |
32.4 (32.3, 32.6) |
| Birthweight | ||||
| <10th centile | 11.3 (9.3, 13.3) |
6.7 (5.9, 7.4) |
7.5 (7.2, 7.8) |
12.2 (12.1, 12.4) |
| 10–90 centile | 75.3 (72.6, 78.1) |
78.6 (77.3, 79.8) |
80.6 (80.1, 81.1) |
80.6 (80.4, 80.7) |
| >90th centile | 13.4 (11.2, 15.5) |
14.8 (13.7, 15.9) |
11.9 (11.5, 12.2) |
7.2 (7.1, 7.3) |
| Hospital level | ||||
| Tertiary | 37.1 (34.0, 40.2) |
36.2 (34.7, 37.6) |
37.9 (37.4, 38.5) |
29.6 (29.4, 29.7) |
| Other Urban | 25.5 (22.7, 28.3) |
29.4 (28.0, 30.8) |
29.5 (29.0, 30.1) |
25.0 (24.8, 25.1) |
| Regional | 24.0 (21.3, 26.7) |
21.1 (19.9, 22.4) |
17.6 (17.2, 18.1) |
18.8 (18.7, 18.9) |
| Private | 13.4 (11.2, 15.5) |
13.2 (12.2, 14.3) |
14.9 (14.5, 15.3) |
26.6 (26.5, 26.8) |
| Second pregnancy | 51.7 (48.6, 54.9) |
57.4 (55.9, 58.9) |
61.8 (61.2, 62.3) |
63.7 (63.5, 63.8) |
| Pregnancy loss | 9.5 (7.6, 11.3) |
8.6 (7.7, 9.4) |
8.2 (7.8, 8.5) |
8.1 (8.0, 8.2) |
aART, Assisted reproductive technology;
bRBC, Red blood cell;
cPPH, Postpartum haemorrhage.
* +RBC +PPH: Transfusion and haemorrhage; +RBC-PPH: Transfusion without haemorrhage; -RBC +PPH: Haemorrhage without transfusion;-RBC–PPH: neither haemorrhage nor transfusion.
All analysis was conducted in SAS v 9.4. Ethics approval was obtained from the NSW Population and Health Services Research Ethics Committee.