Table 4.
Multivariable Regression Model Assessing Prematurity
| Covariates | Estimate (SE) | Risk ratio | 95% confidence interval | P-value |
|---|---|---|---|---|
| Maternal agea | 0.043 (0.008) | 1.04 | 1.03, 1.06 | <0.0001 |
| Race—black | 0.132 (0.136) | 1.14 | 0.88, 1.49 | 0.33 |
| Race—Latino | 0.534 (0.336) | 1.71 | 0.88, 3.29 | 0.11 |
| Race—othera | –0.456 (0.216) | 0.63 | 0.45, 0.97 | 0.035 |
| Ethnicity—Hispanic | –0.160 (0.322) | 0.85 | 0.45, 1.60 | 0.62 |
| Insurance—commercial | 0.033 (0.120) | 1.03 | 0.82, 1.31 | 0.78 |
| Education—high school | 0.079 (0.156) | 1.08 | 0.80, 1.47 | 0.61 |
| Education—college and above | –0.217 (0.170) | 0.81 | 0.58, 1.12 | 0.20 |
| TSH > 4mIU/La | 0.774 (0.322) | 2.17 | 1.15, 4.07 | 0.016 |
| TSH < 0.1 mIU/L | 0.261 (0.214) | 1.30 | 0.85,1.97 | 0.22 |
| BMI at last visit | –0.016 (0.008) | 0.98 | 0.97, 1.00 | 0.064 |
White race, non-Hispanic ethnicity, public insurance, the highest education level below 8th grades, and 0.1 mIU/L ≤ TSH ≤ 4 mIU/L were used as the reference groups.
Abbreviationss: SE, standard error; TSH, thyroid stimulation hormone; BMI, body mass index.
aStatistically significant at α < .05.