Skip to main content
. Author manuscript; available in PMC: 2021 Jul 15.
Published in final edited form as: J Child Lang. 2014 Nov 18;42(6):1173–1190. doi: 10.1017/S0305000914000725

TABLE 3.

Stepwise regression predicting productive vocabulary at 24 months

Variable β R2 Adj R2 Δ R2
Model 1a 0.04 0.01 0.04
 Attention overall −0.01
Model 2b 0.21 0.17 0.17**
 Attention overall −0.03
 Attention to mouth 0.35**
Model 3c 0.28 0.23 0.08*
 Attention overall −0.09
 Attention to mouth 0.28*
 Gaze following 0.29*

NOTES:

*

= p < .05

**

= p < .01.

a

Overall model: F(1,41) = 1.61, n.s.

b

Overall model: F(2,40) = 5.15, p < .05; change from Model 1 to 2: F(1,40) = 8.40, p < .01.

c

Overall model: F(3,39) = 5.14, p < .01; change from Model 2 to 3: F(1,39) = 4.28, p < .05.