Table 3.

Interaction of age and level of word knowledge as independent predictor variable.

	Variables in the Equation						95% confidence interval
	B	SE	Wald	df	p	Odds ratio	Lower	Upper
Age ∗ word knowledge			13.355	4	0.010
Age(1) by word knowledge(1)	-1.515	0.767	3.904	1	0.048	0.220	0.049	0.988
Age(1) by word knowledge(2)	-0.743	0.542	1.880	1	0.170	0.476	0.164	1.376
Age(2) by word knowledge(1)	0.568	0.702	0.655	1	0.418	1.765	0.446	6.990
Age(2) by word knowledge(2)	1.194	0.509	5.514	1	0.019	3.302	1.218	8.947
Constant	1.084	0.096	127.605	1	0.000	2.956

Age(1) = one step up in age (from 2-year-olds to 3-year-olds); age(2) = two steps up in age (from 2-year-olds to 4-year-olds); word knowledge(1) = one step up in level of word knowledge (from “comprehension only” to “labeled upon request”); word knowledge(2) = two steps up in level of word knowledge (from “comprehension only” to “spontaneously labeled”).