Table 1.

Means and (Standard Deviations) for Parent Input Measures by Time and Condition

	Pre-Instruction				Post-Instruction
Measure	Control		Treatment		Control		Treatment
	M	SD	M	SD	M	SD	M	SD
Parent Total Utterances	377.89	107.57	398.68	102.96	386.58	98.96	384.68	92.21
Parent Mean Length of Utterance	3.76	0.52	3.78	0.48	3.96	0.52	4.02	0.54
Parent Number of Different Words	232.37	56.14	236.79	47.99	254.32	49.25	266.63	51.60
Labeling	18.63	9.80	18.16	9.74	21.68	9.84	19.16	9.79
Toy Talk: Pronominal subjects	14.79	8.67	15.42	7.71	19.58	13.67	22.32	12.68
Toy Talk: Lexical NP subjects	7.32	5.09	9.63	6.07	10.05	7.25	40.05	22.26
Toy Talk: Lexical NP types	4.68	3.04	5.58	2.83	6.00	2.96	18.05	9.99

Note. Pre-Instruction data at 21-month session. Post-Instruction data at 24-month session. Control n = 19; Treatment n = 19. NP = Noun Phrase