Table 2.

Relationships between gestational age at delivery, perceived stress, and biological age estimates in the PREG cohort.

	Full sample coef	Full sample SE	Full sample p-value	EA subset coef	EA subset SE	EA subset p-value	AA subset coef	AA subset SE	AA subset p-value
Predicts GAAD
Early BA	0.63	0.21	0.003*	0.40	0.24	0.107	0.71	0.33	0.038
Late BA	0.06	0.18	0.763	$-0.11$	0.26	0.669	0.03	0.27	0.918
Predicts early prenatal PSS
Early BA	$-0.35$	0.13	0.009	$-0.16$	0.19	0.389	$-0.43$	0.17	0.016
Predicts late prenatal PSS
Early BA	$-0.14$	0.14	0.319	$-0.11$	0.21	0.600	$-0.15$	0.19	0.435
Late BA	$-0.09$	0.13	0.514	$-0.07$	0.20	0.715	0.07	0.17	0.669
Predicts late BA
Early PSS	$-0.08$	0.05	0.098	$-0.06$	0.06	0.365	$-0.03$	0.08	0.742

Horvath probe sets were reduced to match the probes available for GAPPS.

coef = coefficient, SE = standard error, EA = European American, AA = African American, PSS = perceived stress scale total score, GAAD = gestational age at delivery, BA = Horvath-derived biological age estimates.

Maternal chronological age was included as a covariate in all models.

${}^{\ast }$Survives Bonferroni adjustment for 6 tests, p-val $<0.008$.