. 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 3. Prediction of Proportion KIDI Correct from Mothers’ Age, Education, Access to Books and Written Materials, and Attendance at a Childbirth Class.

Model	Variable Added	R² _increment	F_increment (1, 234)
Mothers’ education Written materials Childbirth class	Mothers’ age	.013	4.64^*
Mothers’ age Written materials Childbirth class	Mothers’ education	.054	19.03^***
Mothers’ age Mothers’ education Childbirth class	Written materials	.029	10.35^**
Mothers’ age Mothers’ education Written materials	Childbirth class	.002	.88

p ≤ .05

^**

p ≤ .01

^***

p ≤ .001.