Table 4.
Discrimination of comorbidity scoring systems for non-transfusion severe maternal morbidity in California birth data, 2011–2017 (N = 3,308,554)
| N (column %) | Mean SMM comorbidity score (SD) | Area under ROC curve | Area under PR curve | |
|---|---|---|---|---|
| All | 3,308,554 (100) | 4.1 (8.1) | 0.74 | 0.10 |
| Race-Ethnicity (n = 3,225,224) | ||||
| American Indian-Alaska Native | 10,920 (<1) | 4.9 (9.0) | 0.78 | 0.15 |
| Asian | 386,864 (12) | 3.1 (6.7) | 0.73 | 0.09 |
| Black | 164,943 (5) | 5.8 (9.8) | 0.73 | 0.11 |
| Latinx | 1,545,628 (48) | 3.5 (7.5) | 0.74 | 0.12 |
| Pacific Islander | 97,288 (3) | 5.3 (9.3) | 0.74 | 0.12 |
| White | 888,017 (28) | 3.9 (7.7) | 0.72 | 0.08 |
| Multi-race | 127,540 (4) | 4.8 (8.7) | 0.75 | 0.09 |
| Other | 4,024 (<1) | 3.7 (7.7) | 0.76 | 0.09 |
| Nativity (n = 3,308,355) | ||||
| Born in U.S. | 2,074,588 (63) | 4.1 (8.1) | 0.73 | 0.10 |
| Not born in U.S. | 1,233,767 (37) | 3.4 (7.2) | 0.74 | 0.12 |
| Payment method (n = 3,304,448) | ||||
| Commercial insurance | 1,588,867 (48) | 4.2 (8.0) | 0.72 | 0.08 |
| Government programs | 1,560,790 (47) | 3.6 (7.7) | 0.75 | 0.13 |
| Other | 154,791 (5) | 2.7 (6.4) | 0.76 | 0.12 |
| Educational Attainment (n = 3,165,563) | ||||
| Less than high school graduate | 567,248 (18) | 3.6 (7.5) | 0.74 | 0.15 |
| High school graduate or equivalent | 808,836 (26) | 3.6 (7.7) | 0.74 | 0.11 |
| Some college | 845,156 (27) | 4.1 (8.1) | 0.74 | 0.09 |
| College graduate or higher | 944,323 (30) | 3.8 (8.8) | 0.72 | 0.08 |
SMM, severe maternal morbidity; IQR, interquartile range; ROC, receiver operating characteristic