Breakdown of characteristics from index admission for delivery by readmission status
| CV readmission | Non-CV readmission | No readmission | P value | |
| Total pregnancies (n) | 4054 | 259 252 | 1 189 620 | – |
| Age (years) | n (% column) | |||
| Mean±SD | 28.4±6.3 | 25.6±5.9 | 27.5±6.2 | <0.001 |
| Race and ethnicity | n (% column) | |||
| White | 1265 (31%) | 126 489 (49%) | 622 699 (52%) | <0.001 |
| African American | 2296 (57%) | 82 283 (32%) | 254 607 (21%) | |
| Hispanic | 263 (6%) | 39 005 (15%) | 221 356 (19%) | |
| Other | 64 (2%) | 2174 (1%) | 24 172 (2%) | |
| Unknown | 166 (4%) | 9301 (3%) | 66 786 (6%) | |
| Payer | n (% column) | |||
| Medicare | 135 (4%) | 6875 (3%) | 3898 (<1%) | <0.001 |
| Medicaid | 2677 (66%) | 168 798 (65%) | 550 036 (46%) | |
| Private | 1068 (26%) | 72 010 (28%) | 567 529 (48%) | |
| Unknown | 174 (4%) | 11 569 (4%) | 68 157 (6%) | |
| Discharge diagnoses* | n (% column) | |||
| Chronic hypertension | 32 (1%) | 2216 (1%) | 10 420 (1%) | NS |
| Coronary artery disease | 23 (1%) | 72 (<1%) | 42 (<1%) | <0.001 |
| Heart failure | 244 (6%) | 309 (<1%) | 302 (<1%) | <0.001 |
| Hyperlipidaemia | 21 (1%) | 206 (<1%) | 377 (<1%) | <0.001 |
| Arial fibrillation | <10 (<1%) | 198 (<1%) | 151 (<1%) | <0.001 |
| Obesity | 490 (12%) | 10 683 (4%) | 22 586 (2%) | <0.001 |
| Diabetes mellitus | 290 (7%) | 7762 (3%) | 8174 (1%) | <0.001 |
| COPD | 310 (8%) | 16 001 (6%) | 30 829 (3%) | <0.001 |
| Asthma | 286 (7%) | 15 840 (6%) | 30 655 (3%) | <0.001 |
| Alcohol and drugs abuse | 216 (5%) | 11 790 (5%) | 12 429 (1%) | <0.001 |
| Tobacco | 385 (10%) | 24 888 (10%) | 55 005 (5%) | <0.001 |
| Chronic kidney disease | 55 (1%) | 520 (<1%) | 106 (<1%) | <0.001 |
| Acute renal failure | 61 (2%) | 471 (<1%) | 144 (<1%) | <0.001 |
| Anaemia | 763 (19%) | 37 125 (14%) | 97 426 (8%) | <0.001 |
| Thrombocytopenia | 61 (2%) | 2270 (1%) | 8081 (1%) | <0.001 |
| Transfusion | 122 (3%) | 5845 (2%) | 6983 (1%) | <0.001 |
| Anxiety | 48 (1%) | 4883 (2%) | 7938 (1%) | <0.001 |
| Depression | 191 (5%) | 8063 (3%) | 12 877 (1%) | <0.001 |
| Autoimmune | 59 (1%) | 3126 (1%) | 2513 (<1%) | <0.001 |
| Stroke | <10 (<1%) | 51 (<1%) | 28 (<1%) | <0.001 |
| TIA | <10 (<1%) | 27 (<1%) | 31 (<1%) | <0.001 |
| ICH | <10 (<1%) | 24 (<1%) | 32 (<1%) | <0.001 |
| Pneumonia | 31 (1%) | 1003 (<1%) | 740 (<1%) | <0.001 |
| Obstetric diagnoses | n (% column) | |||
| Hypertensive disorder of pregnancy | ||||
| Gestational hypertension† | 270 (7%) | 11 042 (4%) | 44 080 (4%) | <0.001 |
| Pre-eclampsia† | 443 (11%) | 13 168 (5%) | 39 911 (3%) | <0.001 |
| Eclampsia† | <10 (<1%) | 482 (<1%) | 1044 (<1%) | <0.001 |
| Gestational diabetes | 289 (7%) | 7714 (3%) | 7998 (1%) | <0.001 |
| Preterm delivery | 753 (19%) | 35 394 (14%) | 76 413 (6%) | <0.001 |
| Stillbirth | <10 (<1%) | <10 (<1%) | <10 (<1%) | 0.011 |
| Caesarean delivery | 2059 (51%) | 105 144 (41%) | 435 066 (37%) | <0.001 |
*Discharge diagnoses from the index admission for delivery.
†Some women carried more than one HDP diagnosis (eg, gestational hypertension+pre-eclampsia).
COPD, chronic obstructive pulmonary disease; CV, cardiovascular; HDP, hypertensive disorders of pregnancy; ICH, intracerebral haemorrhage; NS, non-significant; TIA, transient ischaemic attack.