. Author manuscript; available in PMC: 2012 Aug 6.

Published in final edited form as: Dev Psychol. 2010 Nov;46(6):1677–1693. doi: 10.1037/a0020677

Table 1. Sample Sociodemographic Data and Correlations with KIDI Proportion Correct.

			Correlation with KIDI Proportion Correct
Sociodemographics	M	SD	Zero-order	Controlling for Mothers’ Age	Controlling for Mothers’ Education
Mother
Age (years)	31.11	6.27	.46^***	-	.15^*
Education^a	5.59	1.35	.49^***	.21^***	-
Occupational status	6.9	1.6	.19^**	.06	.02
Number of hours employed weekly ^b	20.43	19.04	.05	.02	-.03
Child
Age (months)	20.08	2.3	−.10	−.06	−.03
Birth weight (grams)	3522.94	447.18	.04	.06	.04
Family
Hollingshead Index	49.96	13.23	.43^***	.14^*	.02

Note. N = 268.

The education factor in the Hollingshead Four-Factor Index of Social Status (1975) was scaled that: 1 = less than 7^th grade; 2 = 7^th, 8^th, 9^th grade; 3 = 10^th or 11^th grade; 4 = high school graduated or GED; 5 = partial college or specialized training; 6 = standard college or university graduate; 7 = graduate professional training.

Includes homemaker mothers.

p < .05

^**

p < .01

^***

p < .001.