Table 2.
Unadjusted and adjusted models for 60-day postpartum readmission
| RR | 95% CI | aRR | 95% CI | |
|---|---|---|---|---|
| Diabetes | ||||
| Type 1 diabetes | 2.92 | 2.78, 3.07* | 1.77 | 1.69, 1.87* |
| Type 2 diabetes | 2.55 | 2.47, 2.63* | 1.46 | 1.42, 1.51* |
| Gestational diabetes | 1.34 | 1.33, 1.36* | 1.16 | 1.14, 1.17* |
| Unspecified diabetes | 2.63 | 2.42, 2.87* | 1.73 | 1.59, 1.89* |
| No diabetes | Reference | Reference | ||
| Maternal age in years | ||||
| 15-19 years old | 1.26 | 1.25, 1.28* | 1.18 | 1.16, 1.19* |
| 20-24 years old | 1.14 | 1.13, 1.16* | 1.07 | 1.06, 1.08* |
| 25-29 years old | Reference | Reference | ||
| 30-34 years old | 0.95 | 0.94, 0.97 | 0.99 | 0.98, 1.00 |
| 35-39 years old | 1.11 | 1.10, 1.13* | 1.09 | 1.08, 1.11* |
| 40-54 years old | 1.44 | 1.41, 1.47* | 1.27 | 1.24, 1.29* |
| Payer | ||||
| Medicare | 3.22 | 3.12, 3.33* | 2.52 | 2.44, 2.60* |
| Medicaid | 1.51 | 1.50, 1.53* | 1.43 | 1.42, 1.44* |
| Private insurance | Reference | Reference | ||
| Self-pay | 1.00 | 0.97, 1.04 | 1.02 | 0.99, 1.06 |
| No charge | 1.14 | 0.97, 1.35 | 1.11 | 0.94, 1.31 |
| Other | 1.09 | 1.06, 1.12* | 1.11 | 1.08, 1.14* |
| Median ZIP code income quartile | ||||
| Lowest income quartile | 1.50 | 1.48, 1.52* | 1.21 | 1.19, 1.23* |
| 2nd lowest quartile | 1.29 | 1.28, 1.31* | 1.14 | 1.13, 1.16* |
| 2nd highest quartile | 1.19 | 1.17, 1.20* | 1.10 | 1.08, 1.11* |
| Highest income quartile | Reference | Reference | ||
| Cesarean delivery | 1.87 | 1.86, 1.89* | 1.72 | 1.71, 1.73* |
| Delivery postpartum hemorrhage | 1.67 | 1.64, 1.70* | 1.61 | 1.58, 1.64* |
| Systemic lupus erythematosus | 3.41 | 3.21, 3.62* | 2.26 | 2.12, 2.40* |
| Multiple gestation | 1.83 | 1.80, 1.87* | 1.33 | 1.30, 1.36* |
| Asthma | 1.66 | 1.63, 1.69* | 1.42 | 1.39, 1.44* |
| Chronic kidney disease | 3.20 | 3.07, 3.34* | 2.08 | 2.00, 2.18* |
| Hypertensive diseases of pregnancy | 2.48 | 2.46, 2.51* | 2.07 | 2.05, 2.09* |
| Chronic hypertension | 2.68 | 2.63, 2.74* | 2.10 | 2.05, 2.14* |
| Hospital teaching status | ||||
| Metropolitan non-teaching | Reference | Reference | ||
| Metropolitan teaching | 1.11 | 1.10, 1.12* | 1.06 | 1.05, 1.06* |
| Non-metropolitan | 1.02 | 1.00, 1.03 | 0.92 | 0.91, 0.93* |
| Hospital bed size | ||||
| Small | Reference | Reference | ||
| Medium | 1.09 | 1.07, 1.10* | 1.04 | 1.03, 1.06* |
| Large | 1.18 | 1.16, 1.20* | 1.12 | 1.10, 1.14* |
| Hospital safety net burden | ||||
| Low burden | Reference | Reference | ||
| Medium burden | 1.28 | 1.26, 1.30* | 1.09 | 1.07, 1.10* |
| High burden | 1.42 | 1.40, 1.44* | 1.07 | 1.06, 1.09* |
*
denotes statistical significance retained with 99% confidence interval. Hypertensive disease of pregnancy include gestational hypertension and preeclampsia diagnoses. RR, risk ratio; aRR, adjusted risk ratio; CI, confidence interval.