. Author manuscript; available in PMC: 2013 Jun 4.

Published in final edited form as: J Speech Lang Hear Res. 2010 Jul 14;53(4):1040–1051. doi: 10.1044/1092-4388(2009/09-0043)

Table 1.

Participant Characteristics

Participant	Chronological Age (Mos.)	Cognitive Age^a (Mos.)	Language Age^b (Mos.)	Ethnicity	Socio-economic Status^c	Hours of Outside Therapy per week
Richard	40	30	21	White	48	25.5
Lenore	35	22	18	Hispanic	60	18
Donald	37	27	18	White	63	16.5
Jared	41	24	21	White	53	9.25

Bayley Scales of Infant Development, 3^rd Edition

Preschool Language Scales, 4^th Edition

Hollingshead Four Factor Index