. Author manuscript; available in PMC: 2011 Aug 2.

Published in final edited form as: Lang Speech Hear Serv Sch. 2009 Nov 30;41(1):118–128. doi: 10.1044/0161-1461(2009/08-0052)

Table 1.

Descriptive findings for the selected and unselected National Longitudinal Survey of Youth 1979 Children’s (CNLSY79) database sample.

	Selected sample <20^th %tile				Unselected sample

Variable	Mean	SD	Range	n	Mean	SD	Range	n
PIAT–RC	77.99	6.71	65–86	1,666	97.97	14.07	65–135	7,912
PIAT–RR	79.54	7.06	65–88	1,902	100.92	15.23	65–135	9,353
PIAT–M	77.71	6.73	65–86	1,885	97.82	14.00	65–135	9,376
PPVT–R	56.03	13.32	20–70	924	85.89	20.75	20–160	4,401

Note. PIAT–RC = Peabody Individual Achievement Test—Reading Comprehension subtest, PIAT–RR = Peabody Individual Achievement Test—Reading Recognition subtest, PIAT–M = Peabody Individual Achievement Test—Mathematics subtest, and PPVT–R = Peabody Picture Vocabulary Test—Revised.