TABLE 3.

Different language measures of child utterances across age group.

	Age group 1			Age group 2			Age group 3
	Mean	S.D.	Range	Mean	S.D.	Range	Mean	S.D.	Range
MLU	2.73	0.55	1.74–4.3	3.61	0.82	2.26–5.86	3.78	0.77	2.14–5.63
NDW	113.61	27.46	64–179	168.26	40.45	102–265	163.05	45.26	108–258
TNW	507.78	186.32	192–883	679.14	272.83	216–1446	537.09	249.7	277–1106
TTR	0.24	0.06	0.14–0.38	0.27	0.07	0.15–0.50	0.33	0.07	0.20–0.46
TNU	136.39	46.02	36–193	142.5	42.22	62–241	116.59	40.69	62–206
vocD	33.5	8.53	15.9–47.0	41.1	12	16.0–64.7	48.3	6.93	34.6–60.2

MLU, mean length of utterances in word; NDW, number of different words; TNW, total number of words; TTR, type token ratio; TNU, total number of utterances.