Table 3.
Unadjusted and adjusted analysis for readmission to a different hospital than the delivery hospital among women readmitted 60 days postpartum
| Unadjusted model | Adjusted model | |||
|---|---|---|---|---|
| RR | 95% CI | aRR | 95% CI | |
| Maternal age | ||||
| 15–19 years old | 1.04 | 0.99, 1.09 | 0.98 | 0.93, 1.03 |
| 20–24 years old | 1.15 | 1.10, 1.19 | 1.09 | 1.05, 1.14 |
| 25–29 years old | Reference | Reference | ||
| 30–34 years old | 0.91 | 0.88, 0.95 | 0.96 | 0.92, 1.00 |
| 35–39 years old | 0.87 | 0.83, 0.91 | 0.93 | 0.89, 0.98 |
| 40–54 years old | 0.84 | 0.78, 0.91 | 0.92 | 0.85, 0.99 |
| Payer | ||||
| Medicare | 1.67 | 1.51, 1.84 | 1.68 | 1.52, 1.86 |
| Medicaid | 1.33 | 1.30, 1.37 | 1.28 | 1.24, 1.32 |
| Private insurance | Reference | Reference | ||
| Self-pay | 1.22 | 1.08, 1.37 | 1.19 | 1.06, 1.34 |
| No charge | 1.72 | 1.09, 2.72 | 1.57 | 0.99, 2.47 |
| Other | 1.12 | 1.03, 1.22 | 1.07 | 0.98, 1.16 |
| Median ZIP code income quartile | ||||
| Lowest income quartile | 1.13 | 1.08, 1.17 | 1.01 | 0.96, 1.05 |
| 2nd lowest quartile | 1.12 | 1.07, 1.17 | 1.01 | 0.97, 1.06 |
| 2nd highest quartile | 1.02 | 0.98, 1.07 | 0.96 | 0.92, 1.00 |
| Highest income quartile | Reference | Reference | ||
| Delivery postpartum hemorrhage | 1.04 | 0.98, 1.1 | 1.05 | 0.99, 1.11 |
| Cesarean delivery | 0.89 | 0.86, 0.91 | 0.90 | 0.87, 0.92 |
| Pregestational diabetes | 1.04 | 0.95, 1.13 | 1.11 | 1.02, 1.21 |
| Gestational diabetes | 0.95 | 0.90, 1.00 | 1.01 | 0.97, 1.07 |
| Systemic lupus erythematosus | 1.44 | 1.21, 1.71 | 1.40 | 1.18, 1.67 |
| Multiple gestation | 0.84 | 0.78, 0.91 | 0.95 | 0.88, 1.02 |
| Asthma | 0.97 | 0.92, 1.03 | 0.98 | 0.92, 1.04 |
| Chronic kidney disease | 1.40 | 1.23, 1.59 | 1.39 | 1.23, 1.59 |
| Hypertensive diseases of pregnancy | 0.82 | 0.79, 0.84 | 0.84 | 0.81, 0.87 |
| Chronic hypertension | 0.84 | 0.79, 0.90 | 0.87 | 0.81, 0.93 |
| Hospital bed size | ||||
| Small | Reference | Reference | ||
| Medium | 0.84 | 0.80, 0.88 | 0.84 | 0.80, 0.88 |
| Large | 0.76 | 0.72, 0.79 | 0.75 | 0.72, 0.79 |
| Hospital teaching status | ||||
| Metropolitan non-teaching | Reference | Reference | ||
| Metropolitan teaching | 0.86 | 0.84, 0.89 | 0.86 | 0.84, 0.89 |
| Non-metropolitan | 0.92 | 0.88, 0.97 | 0.88 | 0.84, 0.92 |
RR, risk ratio. aRR, adjusted risk ratio. CI, confidence interval. Estimates for medical and obstetric conditions are with absence of the condition as the reference. All variables in the table were included in the adjusted analysis.