Table 1.

Baseline scores and intervention effects on language environment and cognition.

Measure	Pre-Test		Post-Test		Time*Group Interaction η2 (p)
	Intervention M (SD) [n]	Control M (SD) [n]	Intervention M (SD) [n]	Control M (SD) [n]
Adult Words per Hour	1106.50 (381.61) [23]	1258.81 (489.72) [18]	1325.27 (419.16) [21]	1183.68 (451.35) [16]	.076 (.098)†
Conversational Turns per Hour	47.03 (18.88) [23]	55.77 (21.79) [18]	51.63 (20.02) [21]	48.71 (20.73) [16]	.159 (.014)*
Child Vocalizations per Hour	206.71 (83.40) [23]	222.84 (91.39) [18]	216.63 (85.71) [21]	233.59 (111.72) [16]	.002 (n.s.)
Language Composite	98.40 (16.43) [24]	100.18 (15.73) [25]	101.83 (14.54) [24]	103.88 (13.36) [25]	.000 (n.s.)
Nonverbal IQ Composite	9.42 (2.23) [24]	9.93 (2.23) [25]	10.60 (2.18) [24]	10.45 (2.26) [25]	.066 (.074)†
Executive Functioning Composite	−.15 (.63) [24]	0.05 (.77) [25]	0.05 (.54) [24]	−.09 (.86) [25]	.096 (.031)*

^†p < 0.1.

^*p < 0.05.