Table 2.

Group means and standard deviations for each GJ Complex A′ outcome per age level.

GJ Complex outcome	Age level	Unaffected (Child n = 213)			SLI affected (Child n = 270)
		n	M	SD	n	M	SD
Missing Do	5–5;11	172	0.56	0.23	141	0.49	0.22
Missing Do	6–6;11	207	0.69	0.23	221	0.55	0.23
Missing Do	7–7;11	222	0.75	0.24	259	0.63	0.24
Missing Do	8–8;11	222	0.75	0.22	278	0.68	0.24
Missing Do	9–9;11	127	0.78	0.23	198	0.70	0.25
Missing Do	10–10;11	122	0.82	0.22	182	0.68	0.24
Missing Do	11–11;11	131	0.84	0.22	173	0.73	0.24
Missing Do	12–12;11	136	0.87	0.19	162	0.73	0.24
Missing Do	13–13;11	132	0.85	0.19	151	0.72	0.25
Missing Do	14–14;11	111	0.86	0.20	144	0.75	0.22
Missing Do	15–15;11	100	0.86	0.21	125	0.74	0.22
Missing Do	16–16;11	79	0.86	0.20	108	0.68	0.27
Missing Do	17–17;11	53	0.91	0.11	91	0.74	0.25
Missing Do	18–18;11	42	0.90	0.14	59	0.78	0.22
Ungrammatical Lex	5–5;11	172	0.59	0.23	141	0.48	0.23
Ungrammatical Lex	6–6;11	207	0.71	0.23	221	0.55	0.24
Ungrammatical Lex	7–7;11	222	0.78	0.23	259	0.64	0.25
Ungrammatical Lex	8–8;11	222	0.79	0.22	278	0.69	0.24
Ungrammatical Lex	9–9;11	127	0.81	0.20	198	0.71	0.22
Ungrammatical Lex	10–10;11	122	0.83	0.21	182	0.71	0.23
Ungrammatical Lex	11–11;11	131	0.85	0.21	173	0.75	0.21
Ungrammatical Lex	12–12;11	136	0.86	0.19	162	0.73	0.25
Ungrammatical Lex	13–13;11	132	0.86	0.18	151	0.73	0.23
Ungrammatical Lex	14–14;11	111	0.84	0.20	144	0.73	0.21
Ungrammatical Lex	15–15;11	100	0.85	0.20	125	0.71	0.26
Ungrammatical Lex	16–16;11	79	0.86	0.21	108	0.71	0.24
Ungrammatical Lex	17–17;11	53	0.89	0.15	91	0.70	0.21
Ungrammatical Lex	18–18;11	42	0.89	0.14	59	0.71	0.22
Ungrammatical Do + Lex	5–5;11	172	0.59	0.23	141	0.52	0.23
Ungrammatical Do + Lex	6–6;11	207	0.75	0.24	221	0.57	0.25
Ungrammatical Do + Lex	7–7;11	222	0.81	0.24	259	0.68	0.25
Ungrammatical Do + Lex	8–8;11	222	0.84	0.21	278	0.72	0.24
Ungrammatical Do + Lex	9–9;11	127	0.85	0.21	198	0.77	0.23
Ungrammatical Do + Lex	10–10;11	122	0.88	0.19	182	0.78	0.23
Ungrammatical Do + Lex	11–11;11	131	0.90	0.19	173	0.82	0.19
Ungrammatical Do + Lex	12–12;11	136	0.90	0.19	162	0.80	0.23
Ungrammatical Do + Lex	13–13;11	132	0.90	0.17	151	0.81	0.24
Ungrammatical Do + Lex	14–14;11	111	0.91	0.18	144	0.83	0.22
Ungrammatical Do + Lex	15–15;11	100	0.90	0.20	125	0.81	0.22
Ungrammatical Do + Lex	16–16;11	79	0.92	0.18	108	0.79	0.26
Ungrammatical Do + Lex	17–17;11	53	0.96	0.10	91	0.76	0.25
Ungrammatical Do + Lex	18–18;11	42	0.93	0.18	59	0.84	0.21
Double Tense	5–5;11	172	0.54	0.20	141	0.48	0.22
Double Tense	6–6;11	207	0.63	0.23	221	0.54	0.23
Double Tense	7–7;11	222	0.70	0.25	259	0.59	0.21
Double Tense	8–8;11	222	0.76	0.21	278	0.62	0.23
Double Tense	9–9;11	127	0.77	0.24	198	0.61	0.23
Double Tense	10–10;11	122	0.82	0.22	182	0.62	0.25
Double Tense	11–11;11	131	0.84	0.22	173	0.66	0.24
Double Tense	12–12;11	136	0.89	0.16	162	0.69	0.25
Double Tense	13–13;11	132	0.87	0.17	151	0.68	0.23
Double Tense	14–14;11	111	0.87	0.17	144	0.71	0.23
Double Tense	15–15;11	100	0.89	0.17	125	0.73	0.25
Double Tense	16–16;11	79	0.91	0.17	108	0.71	0.23
Double Tense	17–17;11	53	0.94	0.13	91	0.74	0.25
Double Tense	18–18;11	42	0.94	0.14	59	0.73	0.24

Note. Children were tested twice per year through 8 years of age and annually thereafter. Calculations are per age level, with children entering the table more than once due to longitudinal testing. GJ = grammaticality judgment.