Table 2.
Characteristics of Study Population, 2002–2009 Massachusetts Pregnancy to Early Life Longitudinal Data System
| Characteristics | IDD n = 498 n (%) |
No IDD n = 1,531 n (%) |
Test statistic χ2 | p-value |
|---|---|---|---|---|
| Age | 0.45 | 0.930 | ||
| < 20 | 75 (15.1) | 225 (14.7 | ||
| 20–29 | 256 (51.4) | 810 (52.9) | ||
| 30–39 | 149 (29.9) | 438 (28.6) | ||
| 40+ | 18 (3.6) | 58 (3.8) | ||
| Education | 100.54 | <0.001 | ||
| Less than high school | 147 (29.6) | 293 (19.2) | ||
| High school graduate | 230 (46.3) | 474 (31.0) | ||
| Some or more college | 120 (24.1) | 761 (49.8) | ||
| Maternal race/ethnicity | 14.65 | 0.002 | ||
| Hispanic | 99 (19.9) | 318 (20.8) | ||
| Non-Hispanic White | 317 (63.7) | 942 (61.5) | ||
| Non-Hispanic Black | 71 (14.3) | 175 (11.4) | ||
| Other | 11 (2.2) | 96 (6.3) | ||
| Marital Status (% married) | 151 (30.3) | 792 (51.9) | 70.06 | <0.001 |
| Public health insurance | 388 (78.7) | 708 (46.5) | 155.49 | <0.001 |
| Other Characteristics | ||||
| Father named on birth certificate | 337 (67.7) | 1,334 (87.1) | 97.95 | <0.001 |
| Smoking during pregnancy | 92 (18.6) | 145 (9.5) | 29.78 | <0.001 |
| Prenatal care 1st trimester | 332 (67.6) | 1,138 (74.9) | 9.92 | 0.002 |
| Prenatal care utilization index | 27.56 | <0.001 | ||
| Inadequate | 92 (18.7) | 168 (11.1) | ||
| Intermediate | 34 (6.9) | 120 (7.9) | ||
| Adequate | 162 (32.9) | 652 (43.0) | ||
| Adequate plus | 204 (41.5) | 577 (38.0) | ||
| Pregnancy complications | ||||
| Diabetes | 25 (5.8) | 56 (3.7) | 1.89 | 0.170 |
| Hypertension | 25 (5.8) | 46 (3.0) | 4.62 | 0.032 |
| Other pregnancy complication | 342 (70.4) | 742 (48.9) | 68.26 | <0.001 |
| Mental illness | ||||
| Major Mental illness | 129 (25.9) | 59 (3.9) | 217.32 | <0.001 |
| Other mental illness | 105 (37.2) | 80 (5.2) | 337.25 | <0.001 |
Note. IDD = intellectual and developmental disabilities.