Table 2.
Bivariate correlations between case status, cortisol by trimester, gestational age at blood draw, and potential covariates.
| Case status |
Cortisol (T1) |
GA at blood draw (T1) |
Cortisol (T2) |
GA at blood draw (T2) |
Cortisol (T3) |
GA at blood draw (T3) |
Birth weight |
Gestational age |
Maternal age at childbirth |
African- American |
Maternal education |
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cortisol (T1) | −0.05 | – | ||||||||||
| GA at blood draw (T1) | 0.10 | 0.13 | – | |||||||||
| Cortisol (T2) | −0.12 | 0.30 | −0.31 | – | ||||||||
| GA at blood draw (T2) | −0.05 | −0.13 | 0.28 | 0.32*** | – | |||||||
| Cortisol (T3) | −0.10 | 0.44** | −0.08 | 0.53*** | 0.09 | – | ||||||
| GA at blood draw (T3) | 0.03 | 0.06 | −0.09 | −0.09 | 0.11 | −0.07 | – | |||||
| Birth weight | 0.08 | 0.14 | 0.08 | −0.10 | −0.05 | −0.05 | −0.02 | – | ||||
| Gestational age | 0.10 | −0.22 | 0.15 | −0.08 | −0.07 | −0.05 | 0.001 | 0.37*** | – | |||
| Maternal age at childbirth | 0.05 | −0.13 | −0.01 | −0.02 | −0.11 | −0.25** | 0.05 | −0.09 | −0.02 | – | ||
| Race (African American) | 0.06 | 0.11 | −0.26* | −0.22* | −0.01 | −0.02 | 0.01 | −0.21** | −0.14 | −0.13 | – | |
| Maternal education | −0.17* | −0.12 | 0.10 | 0.22* | 0.09 | −0.01 | 0.15 | 0.06 | 0.01 | 0.20* | −0.22** | – |
| Male sex | −0.03 | 0.07 | 0.27* | −0.09 | −0.12 | −0.18* | 0.07 | 0.10 | −0.07 | 0.09 | 0.04 | −0.08 |
a
Abbreviations: GA: gestational age; T1: Trimester1; T2: Trimester 2; T3; Trimester3.
*
p < 0.05.
**
p < 0.01.
***
p < 0.001.