Table 1.
Description of study population and percent VBAC deliveries, Massachusetts
| 1996–2010 (N = 119, 752)a
|
2006–2010 (N = 46, 081)b
|
|||
|---|---|---|---|---|
| n (%) | % VBAC | n (%) | % VBAC | |
| Maternal age (years) | ||||
| <24 | 11,580 (9.7) | 20.9 | 4581 (9.9) | 8.8 |
| 25–29 | 23,493 (19.6) | 19.0 | 9219 (20.0) | 9.1 |
| 30–34 | 44,239 (36.9) | 17.9 | 16,048 (34.8) | 9.3 |
| 35+ | 40,440 (33.8) | 15.4 | 16,233 (35.2) | 8.7 |
| Parity | ||||
| 2 | 76,871 (64.2) | 15.3 | 30,594 (66.4) | 7.5 |
| 3+ | 42,881 (35.8) | 21.7 | 15,487 (33.6) | 12.0 |
| Maternal education | ||||
| Less than high school | 10,096 (8.4) | 19.1 | 4008 (8.7) | 9.6 |
| High school graduate | 30,990 (25.9) | 17.3 | 11,258 (24.4) | 8.1 |
| Some college | 29,245 (24.4) | 17.1 | 10,005 (21.7) | 7.6 |
| College graduate and higher | 49,209 (41.1) | 17.7 | 20,735 (45.0) | 10.0 |
| Missing | 212 (0.2) | 24.1 | 75 (0.2) | 17.3 |
| Marital status | ||||
| Married | 94,480 (78.9) | 17.6 | 34,846 (75.6) | 9.0 |
| Not married | 25,272 (21.1) | 17.5 | 11,235 (24.4) | 9.0 |
| Maternal place of birth | ||||
| US born | 87,673 (73.3) | 18.0 | 31,723 (68.9) | 8.6 |
| Foreign born | 32,014 (26.7) | 16.5 | 14,350 (31.1) | 9.9 |
| Delivery payment | ||||
| Private | 84,788 (70.8) | 17.8 | 30,708 (66.7) | 9.1 |
| Public | 33,779 (28.2) | 16.7 | 15,094 (32.8) | 8.7 |
| Other | 1162 (1) | 29.9 | 271 (0.6) | 14.4 |
| Prenatal care | ||||
| Adequate | 101,450 (84.7) | 17.2 | 38,769 (84.1) | 8.8 |
| Less than adequate | 18,302 (15.3) | 19.5 | 7312 (15.9) | 9.9 |
| Birth weight | ||||
| Low birth weight | 2013 (1.7) | 16.3 | 797 (1.7) | 9.2 |
| Normal birth weight | 100,841 (84.3) | 18.1 | 39,585 (86.0) | 9.3 |
| High birth weight | 16,822 (14.1) | 14.5 | 5665 (12.3) | 6.8 |
a
Missing values: maternal place of birth (65), delivery payment (23), birth weight (76)
b
Missing values: maternal place of birth (8), delivery payment (8), birth weight (34)