Table 3.
Adjusted Risk Ratios for Postpartum Readmission With or Without Evidence of Severe Maternal Morbidity, by Readmission Timing, Among Oregon Hospital Births (n = 158,653), 2012–2017
| PPR With Evidence of SMM | PPR Without Evidence of SMM | |||||||
|---|---|---|---|---|---|---|---|---|
|
≤6 Weeks PP
(n = 352) |
7–52 Weeks PP
(n = 456) |
≤6 Weeks PP
(n = 1,259) |
7–52 Weeks PP
(n = 2,074) |
|||||
| Characteristic | aRR | 95% CI | aRR | 95% CI | aRR | 95% CI | aRR | 95% CI |
| Maternal age, years | ||||||||
| 15–19 | 1.53 | 1.01, 2.31 | 1.11 | 0.76, 1.61 | 1.50 | 1.21, 1.85 | 1.64 | 1.40, 1.91 |
| 20–24 | 0.92 | 0.67, 1.27 | 0.93 | 0.72, 1.21 | 0.98 | 0.84, 1.15 | 1.25 | 1.11, 1.40 |
| 25–29 | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent |
| 30–34 | 0.96 | 0.72, 1.30 | 0.78 | 0.61, 1.00 | 0.85 | 0.73, 0.99 | 0.87 | 0.78, 0.99 |
| 35–39 | 1.66 | 1.22, 2.26 | 0.75 | 0.55, 1.04 | 1.15 | 0.96, 1.37 | 0.77 | 0.65, 0.90 |
| ≥40 | 1.14 | 0.61, 2.12 | 1.46 | 0.93, 2.28 | 1.36 | 1.02, 1.83 | 0.78 | 0.58, 1.05 |
| Maternal residential locationa | ||||||||
| Urban | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent |
| Rural | 1.24 | 1.00, 1.54 | 1.08 | 0.89, 1.31 | 1.00 | 0.89, 1.13 | 1.07 | 0.98, 1.17 |
| Health insurance type at deliveryb | ||||||||
| Commercial | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent |
| Medicaid | 1.81 | 1.41, 2.34 | 2.29 | 1.80, 2.90 | 1.10 | 0.97, 1.25 | 2.00 | 1.79, 2.24 |
| Model of deliveryc | ||||||||
| Vaginal | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent |
| Cesarean | 1.66 | 1.33, 2.06 | 1.37 | 1.13, 1.67 | 1.69 | 1.50, 1.89 | 1.21 | 1.10, 1.33 |
| Extended delivery length of stayd | 1.99 | 1.57, 2.51 | 1.78 | 1.44, 2.19 | 1.53 | 1.34, 1.74 | 1.41 | 1.27, 1.56 |
| SMM at deliverye | 8.03 | 5.49, 11.75 | 3.72 | 2.31, 5.97 | 2.40 | 1.70, 3.38 | 1.57 | 1.12, 2.21 |
| Prepregnancy diabetesf | 1.60 | 0.90, 2.86 | 3.88 | 2.74, 5.49 | 2.42 | 1.88, 3.12 | 3.14 | 2.63, 3.76 |
| Gestational diabetesf | 1.15 | 0.81, 1.62 | 0.93 | 0.66, 1.31 | 1.14 | 0.95, 1.37 | 1.41 | 1.23, 1.62 |
| Any hypertensive disorder of pregnancyg | ||||||||
| Any disorder | 2.67 | 2.08, 3.43 | 1.96 | 1.54, 2.5 | 2.42 | 2.12, 2.77 | 1.51 | 1.34, 1.71 |
| No evidence | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent |
| Hypertensive disorders of pregnancyg | ||||||||
| Chronic hypertension | 2.95 | 1.89, 4.59 | 2.62 | 1.75, 3.93 | 2.70 | 2.12, 3.44 | 1.88 | 1.51, 2.33 |
| Gestational hypertension | 1.81 | 1.17, 2.79 | 1.66 | 1.13, 2.44 | 1.70 | 1.35, 2.15 | 1.06 | 0.85, 1.32 |
| Preeclampsia/eclampsia | 4.49 | 3.07, 6.58 | 1.78 | 1.08, 2.93 | 2.64 | 2.05, 3.39 | 1.60 | 1.26, 2.03 |
| Superimposed | 1.82 | 0.86, 3.86 | 2.06 | 1.13, 3.74 | 3.76 | 2.88, 4.91 | 2.09 | 1.61, 2.72 |
| No evidence | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent |
| Substance use disorderh | ||||||||
| Any disorder | 2.68 | 1.97, 3.65 | 2.75 | 2.12, 3.56 | 1.57 | 1.30, 1.90 | 2.10 | 1.86, 2.38 |
| Any disorder (excluding cannabis) | 2.90 | 2.11, 3.99 | 2.9 | 2.21, 3.79 | 1.68 | 1.37, 2.04 | 2.19 | 1.92, 2.50 |
| Mental health diagnosesi | ||||||||
| Any diagnosis | 1.22 | 0.85, 1.77 | 1.71 | 1.29, 2.27 | 1.53 | 1.29, 1.83 | 2.46 | 2.19, 2.75 |
| Depression | 1.38 | 0.66, 2.92 | 2.58 | 1.59, 4.18 | 1.33 | 0.90, 1.98 | 2.63 | 2.12, 3.26 |
| Anxiety | 1.40 | 0.85, 2.31 | 1.54 | 1.01, 2.34 | 1.58 | 1.24, 2.02 | 2.29 | 1.95, 2.68 |
| Serious mental illness | 0.87 | 0.45, 1.69 | 1.58 | 1.02, 2.45 | 1.85 | 1.45, 2.35 | 2.68 | 2.29, 3.14 |
| Other | 1.37 | 0.65, 2.89 | 1.93 | 1.11, 3.36 | 1.96 | 1.42, 2.70 | 3.22 | 2.65, 3.90 |
Abbreviations: aRR, adjusted risk ratio; CI, confidence interval; HDP, hypertensive disorders of pregnancy; MH, mental health; MRL, maternal residential location; PP, postpartum; PPR, postpartum readmission; SMM, severe maternal morbidity; SUD, substance use disorder.
a The model adjusted for maternal age.
b The model adjusted for maternal age, MRL, any SUD, and any MH diagnosis.
c The model adjusted for maternal age, MRL, insurance type at delivery, any SUD, any MH diagnosis, any diabetes, and any HDP.
d The model adjusted for maternal age, MRL, insurance type at delivery, any SUD, any MH diagnosis, any diabetes, HDP, and mode of delivery.
e The model adjusted for maternal age, MRL, insurance type at delivery, any diabetes, and HDP.
f The model adjusted for maternal age, MRL, any SUD, and any MH diagnosis.
g The models adjusted for maternal age, MRL, any SUD, and any MH diagnosis.
h The model adjusted for maternal age, MRL, and any MH diagnosis.
i The model adjusted for maternal age and MRL.