Table 2.
Maternal characteristics by hospital obstetric volume categories (percent)
| Non-rural | Rural | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Overall | Hospital volume category | Overall | Hospital volume category | ||||||
| 1 50–1,199 |
2 1,200– 2,399 |
3 2,400– 3,599 |
4 ≥3,600 |
R1 50–599 |
R2 600–1,699 |
R3 ≥1,700 |
|||
| N=678,622 births n= 211 hospitals |
N= 48,450 n=49 |
N= 164,372 n=69 |
N= 183,573 n=48 |
N= 282,227 n=45 |
N= 58,021 births n=56 hospitals |
N= 17,742 n=35 |
N= 17,699 n=14 |
N= 22,580 n=7 |
|
| Nulliparous | 46.8 | 44.4 | 47.3 | 45.6 | 47.6 | 43.0 | 45.4 | 43.0 | 41.1 |
| Advanced maternal age |
15.1 | 14.9 | 15.6 | 13.4 | 16.0 | 8.5 | 9.1 | 9.0 | 7.7 |
| Public insurance | 49.2 | 56.1 | 45.5 | 50.4 | 49.4 | 69.2 | 64.1 | 70.4 | 71.7 |
| Education ≥ 12 years | 47.2 | 43.3 | 48.2 | 44.4 | 49.0 | 30.2 | 38.1 | 32.7 | 22.1 |
| Prenatal care initiated in 1st trimester |
83.6 | 80.2 | 82.0 | 83.2 | 85.5 | 70.5 | 73.7 | 68.2 | 69.7 |
| Race/ethnicity | |||||||||
| White | 26.3 | 28.1 | 30.5 | 24.0 | 25.1 | 33.2 | 55.0 | 29.3 | 19.2 |
| Black | 4.9 | 4.0 | 4.1 | 5.3 | 5.2 | 2.4 | 2.4 | 0.8 | 3.6 |
| Hispanic | 54.0 | 55.6 | 53.1 | 56.6 | 52.5 | 58.7 | 34.2 | 65.2 | 72.9 |
| Asian-American | 12.9 | 10.2 | 10.2 | 12.1 | 15.3 | 2.7 | 3.1 | 2.0 | 3.0 |
| Other | 2.1 | 2.1 | 2.1 | 1.9 | 2.0 | 2.9 | 5.3 | 2.7 | 1.3 |