Table 3.

t-test results of the spelling test of the DTRS of the two groups: mean, SD, t value and P value. N.S. = number of subjects, %KW = % known words, %UW = % unknown words, N.D.E.KW = number of dysphonetic errors of known words, D.E.IOL.UW = dysphonetic errors-insertion/omission of letters of known words, N.DY.E.KW = number of dyseidetic errors of known words, N.D.E.UW = number of dysphonetic errors of unknown words, D.E.MDL.UW = dysphonetic errors of missing double letters of unknown words, D.E.A.UW = dysphonetic errors of accent of unknown words, D.E.GP.UW = dysphonetic errors correspondence grapheme-phoneme of unknown words, D.E.IOL.UW = dysphonetic errors-insertion/omission of letters of unknown words, D.E.MG.UW = dysphonetic errors-mismatch of grapheme of unknown words.

	%KW	%UW	N.D.E.KW	D.E.IOL.KW	N.DY.E.KW	N.D.E.UW	D.E.MDL.UW	D.E.A.UW	D.E.GP.UW	D.E.IOL.UW	D.E.MGUW
DD (N.S. = 169)—Means	71.81	47.65	1.9	1.06	1.2	5.1	1.35	0.28	1.51	1.21	0.56
NSRD (N.S. = 36)—Means	89.44	83.61	0.6	0.29	0.4	1.7	0.3	0.11	0.5	0.55	0.2
DD—SD	18.68	15.5	1.6	1.17	1.4	2.4	1.46	0.53	1.54	1.23	0.13
NSRD—SD	7.43	5.84	0.7	0.51	0.5	1	0.51	0.31	0.64	0.68	0.34
DD Vs. NSRD P value	2.8 × 10−10	1.4 × 10−33	3.2 × 10−7	2.4 × 10−5	1.0 × 10−10	1.5 × 10−17	4.8 × 10−6	0.012	1.2 × 10−5	0.001	0.008
DD Vs. NSRD t value	−6.61	−14.38	5.27	4.31	3.55	9.29	4.69	2.53	4.47	3.3	2.68