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. Author manuscript; available in PMC: 2013 Jun 1.

Published in final edited form as: J Speech Lang Hear Res. 2012 Jan 5;55(3):811–823. doi: 10.1044/1092-4388(2011/11-0086)

Table 1.

Characteristics of the CI and NH groups

	CI group		NH group		Between groups
Variable	M	SD	M	SD	t	p	d
Age at testing (months)	49.46	(6.54)	46.61	(7.72)	1.37	.178	0.40
Maternal education (years)	15.18	(3.02)	16.00	(2.34)	1.02	.314	0.30
Age at CI (months)	20.96	(6.94)
CI experience (months)	27.65	(6.98)
Language comprehension (SS)	85.83	(17.66)	112.17	(11.86)	5.98	<.001	1.75
Language expression (SS)	84.79	(13.80)	112.78	(12.14)	7.37	<.001	2.15
Receptive vocabulary (SS)	91.39	(15.88)	114.09	(15.58)	4.89	<.001	1.44
Speech production (SS)	83.21	(18.66)	102.43	(11.14)	4.31	<.001^a	1.25
Speech perception (d-prime)	1.89	(1.00)	2.51	(0.41)	NA	.105^b	NA

Note. SS = standard score, with a mean of 100 and a standard deviation of 15.

^a

Equal variances not assumed.

^b

Mann-Whitney U-test.