Table 3. First pregnancy factors associated with increased risk of severe maternal morbidity in a second birth, amongst women with a first and second birth.
| Severe maternal morbidty n(%) |
aRRe | 95% Confidence Interval | p- value | ||
|---|---|---|---|---|---|
| Private Insurance | Yes | 408/ 87759 (0.5) | 0.9 | (0.8, 1.0) | 0.2 |
| No | 673/ 139488 (0.5) | Ref f | |||
| Australian born | Yes | 779/ 162402 (0.5) | 1 | (0.9, 1.2) | 0.7 |
| No | 302/ 64845 (0.5) | Ref | |||
| Smoker | Yes | 108/ 21348 (0.5) | 1.1 | (0.9, 1.4) | 0.3 |
| No | 970/ 205290 (0.5) | Ref | |||
| Any ARTa | Yes | 50/ 8205 (0.6) | 1.1 | (0.8, 1.5) | 0.5 |
| No | 1031/ 219042 (0.5) | Ref | |||
| Pregnancy hypertension | Yes | 157/ 24472 (0.6) | 1.3 | (1.1, 1.6) | <0.01 |
| No | 924/ 202775 (0.5) | Ref | |||
| Chronic hypertension | Yes | 16/ 1674 (1.0) | 1.5 | (0.9, 2.5) | 0.2 |
| No | 1065/ 225573 (0.5) | Ref | |||
| Gestational diabetes | Yes | 67/ 11646 (0.6) | 1.2 | (0.9, 1.5) | 0.3 |
| No | 1014/ 215601 (0.5) | Ref | |||
| Chronic conditions | Yes | 76/ 5610 (1.4) | 2.8 | (2.2, 3.6) | < .0001 |
| No | 1005/ 221637 (0.5) | Ref | |||
| Large for gestational age | Yes | 110/ 17495 (0.6) | 1.3 | (1.1, 1.6) | 0.02 |
| No | 971/ 209752 (0.5) | Ref | |||
| Morbidly adherent placenta | Yes | 5/ 428 (1.2) | 1.8 | (0.8, 4.3) | 0.3 |
| No | 1076/ 226819 (0.5) | Ref | |||
| Placenta praevia | Yes | 23/ 1644 (1.4) | 2.5 | (1.6, 3.8) | <0.01 |
| No | 1058/ 225603 (0.5) | Ref | |||
| Maternal age | Under 20 | 66/ 16631 (0.4) | 0.8 | (0.6, 1.1) | <0.01 |
| 20–34 | 862/ 188582 (0.5) | Ref | |||
| 35+ | 153/ 21999 (0.7) | 1.5 | (1.2, 1.8) | ||
| Socioeconomic status | Highest disadvantage | 199/ 44950 (0.4) | 0.9 | (0.8, 1.1) | 0.2 |
| 2 | 181/ 42651 (0.4) | 0.9 | (0.7, 1.1) | ||
| 3 | 229/ 42426 (0.5) | 1.1 | (0.9, 1.3) | ||
| 4 | 218/ 44902 (0.5) | 1.0 | (0.8, 1.2) | ||
| Highest SESc | 247/ 50191 (0.5) | Ref | |||
| PPHb Type** | +PPH+RBCd | 24/ 2399 (1.0) | 2.0 | (1.3, 3.0) | <0.01 |
| +PPH–RBC | 103/ 16869 (0.6) | 1.3 | (1.0, 1.6) | ||
| -PPH+RBC | 11/ 491 (2.2) | 4.1 | (2.2, 7.4) | ||
| -PPH-RBC | 943/ 207488 (0.5) | Ref | |||
| Year of birth | 1 | (1.0, 1.0) | 0.2 |
aART: Assisted reproductive technology;
bPPH: Postpartum haemorrhage;
cSES: socioeconomic status;
dRBC, Red blood cell;,
eaRR: Adjusted Relative Risk.
fRef: reference category
** +RBC +PPH: Transfusion and haemorrhage; +RBC-PPH: Transfusion without haemorrhage; -RBC +PPH: Haemorrhage without transfusion;-RBC–PPH: neither haemorrhage nor transfusion.