Table 2.

Counts by Age and Group

	LRC	HRA±	HRA−
18 months mean # words	27.5 ± 30.0	32.5 ± 32.0	38.1 ± 31.8
24 months mean # words	42.1 ± 22.3	53.5 ± 47.5	81.1 ± 66.0
36 months mean # words	86.3 ± 39.5	54.1 ± 22.4	71.8 ± 47.2
18 months mean # errors	9.0± 13.3	4.5 ± 3.1	12.0 ± 17.0
24 months mean # errors	9.9 ± 8.4	8.4 ± 12.3	13.4 ± 11.3
36 months mean # errors	6.6 ± 8.6	8.5 ± 10.9	8.0 ± 7.8
18 months mean # of /b/	15.7 ± 18.1	19.1 ± 17.9	25.5 ± 23.8
24 months mean # of /b/	22.7 ± 15.7	30.1 ± 30.0	38.1 ± 35.5
36 months mean # of /b/	39.2 ± 24.8	26.4 ± 12.7	35.2 ± 21.9
18 months mean # of /p/	23.8 ± 4.0	6.7 ± 13.1	5.9 ± 7.2
24 months mean # of /p/	8.6 ± 7.6	9.0 ± 8.0	16.6 ± 25.7
36 months mean # of /p/	22.2 ± 12.6	14.5 ± 7.1	20.2 ± 12.9
18 months # children with ≥ 3 /b/	14	11	15
24 months # children with ≥ 3 /b/	19	11	19
36 months # children with ≥ 3 /b/	19	11	19
18 months # children with ≥ 3 /p/	10	7	13
24 months # children with ≥ 3 /p/	18	9	18
36 months # children with ≥ 3 /p/	19	11	18