Table 1.

Number of different words (NDW) and mean length of utterance (MLU) at ages 1;9–2;6.

Child a	Age
	1;9		2;0		2;3		2;6
	NDW	MLU	NDW	MLU	NDW	MLU	NDW	MLU
M06	19	1.08	16	1.15	68	1.81	49	1.84
01G	46	1.37	26	1.48	80	2.01	63	1.59
F16	24	1.28	24	1.20	73	1.73	80	1.96
59B	45	1.29	86	1.84	88	2.68	94	2.45
45G	31	1.19	78	1.54	82	1.60	97	1.82
13B	12	1.18	54	1.86	58	1.46	99	1.99
09G	39	1.41	100	1.70	126	2.35	105	2.02
61B	51	1.31	80	1.96	96	1.77	115	2.25
03G	37	1.27	78	1.68	94	1.92	118	2.41
M01	17	1.26	48	1.25	88	1.63	123	2.23
51G	23	1.06	71	1.46	102	1.81	129	2.14
M16	34	1.24	67	2.23	97	2.02	132	2.46
55G	25	1.24	69	1.42	108	2.63	137	2.48
47B	14	1.13	41	1.75	96	1.96	139	2.18
33B	59	1.61	93	1.98	108	2.39	175	2.52

^a Children from the DeKalb cohort are identified as M = male and F = female; children from the Champaign cohort are identified as B = male and G = female.