Table 2.
Comparison of women linked to infants using different methods at two sites which augmented linkage using birth certificate data*
| SITE 1 | SITE 2 | |||
|---|---|---|---|---|
| Links from birth certificates (60% of pairs) |
Links from health plan records alone (40% of pairs) |
Links from birth certificates (13% of pairs) |
Links from health plan records alone (87% of pairs) |
|
| Hispanic (%) | 64.3 | 41.5 | 7.4 | 5.6 |
| Race (%) | ||||
| White | 91.7 | 92.1 | 72.3 | 81.1 |
| Black | 2.3 | 1.2 | 11.0 | 4.6 |
| Asian American | 0.1 | 0.5 | 10.6 | 9.1 |
| Pacific Islander | 1.1 | 3.2 | 2.3 | 2.6 |
| Native American | 3.9 | 3.0 | 2.0 | 1.1 |
| Education: < high school graduate (%) |
30.3 | 4.1 | 16.5 | 3.7 |
| Age (%) | ||||
| <18 | 8.1 | 0.7 | 4.0 | 1.0 |
| 18–39 | 91.0 | 95.4 | 83.3 | 76.8 |
| 40+ | 0.9 | 3.9 | 2.3 | 4.1 |
| Medicaid insurance (%) | 73.8 | 6.6 | 32.0 | 6.0 |
| Smoking status (%) | ||||
| Smoker | 12.5 | 4.1 | 4.0 | 1.0 |
| Nonsmoker | 85.9 | 94.2 | 18.0 | 20.0 |
| Unknown | 1.6 | 1.7 | 78.0 | 79.0 |
| Nulliparous (%) | 71.4 | 73.9 | 48.0 | 42.0 |
*
Limited to the two sites which identified additional linked mother-infant pairs from the public record portion of state birth certificate files. Characteristics included in the table are derived from birth certificate data. All comparisons between groups linked using different methods within each site are statistically significant (p<0.01).