. Author manuscript; available in PMC: 2016 May 1.

Published in final edited form as: J Pediatr. 2015 Feb 11;166(5):1181–1186. doi: 10.1016/j.jpeds.2015.01.003

Table 2.

Bivariate Correlation between Key Covariates

	Maternal age	Race	Maternal education	Birth Weight	Gestational age	Paternal age
Maternal age	-----	0.17	0.24	0.02	0.03	0.64^***
Race		-----	0.37^**	0.33^**	0.11	0.03
Maternal education			-----	0.29^*	0.35^**	0.13
Birth Weight				-----	0.38^**	−0.02
Gestational age					-----	0.04
Paternal age						-----

Spearman correlations:

p< .05

^**

p<.01

^***

p<.001