Table 1.

Participant Characteristics at Initial Assessment (N = 98)

Variable	Mean	(SD)	Range
Chronological age at interview	31.63	(4.51)	23 – 47
Autism symptom severity	7.38	(1.95)	1 – 10
Age of first words	19.49	(6.80)	7 – 37
Age of first phrases (n = 30)	28.67	(6.56)	10 – 45
Number of words (n = 97)	35.78	(39.13)	0 – 100
PLS-4 Standard Score (n = 94)
Auditory comprehension	61.56	(13.30)	50 – 117
Expressive communication	74.71	(11.30)	50 – 110
MSEL VR T-score (n = 76)	37.04	(11.55)	20 – 68
VABS-II Composite (n = 94)	78.13	(7.49)	61 – 99

Note. Age and age-equivalent scores are given in months. PLS-4 = Preschool Language Scale, Fourth Edition (Zimmerman et al., 2002). MSEL VR = Mullen Scales of Early Learning Visual Reception subtest (Mullen, 1995). VABS-II = Vineland Adaptive Behavior Scales-II (Sparrow et al., 2005).