Table 2. Operative Delivery Volumes from Nine States in 2008, According to State Inpatient Data, By Operative Delivery Method and Hospital Category*.
| Operative delivery method | Hospital category | Total | P value | ||
|---|---|---|---|---|---|
| Major teaching | Minor teaching | Nonteaching | |||
| No. all operative births | 87,686 | 144,040 | 392,274 | 624,000 | |
| No. hospitals performing | 68 | 130 | 637 | 835 | |
| Hospital operative birth volume, mean (IQR) | 1,289.5 (559-1,528) | 1,108.0 (484-1443) | 615.8 (145-868) | 755.4 (183-1053) | < .0001 |
| No. cesarean deliveries | 65,948 | 99,080 | 259,196 | 424,224 | |
| Hospitals performing, no. (%) | 68 (100.0) | 130 (100.0) | 637 (100.0) | 835 (100.0) | |
| Hospital cesarean volume, mean (IQR) | 969.8 (461-1,133) | 757.8 (340-1,033) | 406.9 (95-569) | 513.6 (123-718) | < .0001 |
| % of all operative births, no. (%) | 65,948 (75.2) | 99,080 (68.8) | 259,196 (66.1) | 424,224 (68.0) | < .0001 |
| No. vacuum extractions | 18,061 | 38,333 | 117,642 | 174,036 | |
| Hospitals performing, no. (%) | 60 (88.2) | 126 (96.9) | 618 (97.0) | 804 (96.3) | |
| Hospital vacuum volume, mean (IQR) | 301.0 (103-386) | 304.2 (131-392) | 190.4 (41-252) | 218.4 (53-295) | < .0001 |
| % of all operative births, no. (%) | 18,061 (20.6) | 38,333 (26.6) | 117,642 (30.0) | 174,036 (27.9) | < .0001 |
| No. forceps deliveries | 1,439 | 1,534 | 3,185 | 6,158 | |
| Hospitals performing, no. (%) | 57 (83.8) | 100 (76.9) | 358 (51.7) | 515 (61.7) | |
| Hospital forceps volume, mean (IQR) | 25.2 (6-35) | 15.3 (3-16) | 8.9 (2-11) | 12.0 (2-14) | < .0001 |
| % of all operative births, no. (%) | 1,439 (1.6) | 1,534 (1.1) | 3,185 (0.8) | 6,158 (1.0) | < .0001 |
| No. two or more attempted procedures | 2,238 | 5,093 | 12,251 | 19,582 | |
| Hospitals performing, no. (%) | 59 (86.8) | 117 (90.0) | 495 (77.7) | 671 (80.4) | |
| Hospital ≥ two procedures volume, mean (IQR) | 37.9 (14-47) | 43.5 (12-51) | 24.7 (4-32) | 29.4 (6-39) | < .0001 |
| % of all operative births, no. (%) | 2,238 (2.5) | 5,093 (3.5) | 12,251 (3.1) | 19,582 (3.1) | < .0001 |
*
We categorized hospitals that were members of the Association of American Medical Colleges' Council of Teaching Hospitals and Health Systems (COTH) as major teaching hospitals, non-COTH hospitals that had one or more accredited residency training program as minor teaching hospitals, and all other hospitals as nonteaching hospitals. IQR indicates interquartile range.