. 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 1.

Stepwise regression predicting receptive vocabulary at 18 months

Variable	β	R²	Adj R²	Δ R²
Model 1^a		0.01	−0.02	0.01
Attention overall	−0.05
Model 2^b		0.07	0.03	0.05
Attention overall	−0.07
Attention to mouth	0.26
Model 3^c		0.11	0.06	0.05
Attention overall	−0.12
Attention to mouth	0.21
Gaze following	0.23

NOTES:

Overall model: F(1,55) = 0.14, n.s.

Overall model: F(2,54)= 1.96, n.s.; change from Model 1 to 2: F(1,54) = 3·77, p = .06.

Overall model: F(3,52) = 2.26, n.s.; change from Model 2 to 3: F(1,52) = 2.74, n.s.