Table 3:

Comparison of total scores and sub-scores for children in Phase II: test-retest reliability

Variables	1st visit	2nd visit	ICC
Total scores
Raw scores, mean ± SD (min, max)	28.8 ± 12.5 (13, 69)	27.5 ± 11.1 (11, 66)	0.82
T scores, mean ± SD (min, max)	44.9 ± 4.8 (39, 60)	44.5 ± 4.3 (38, 59)	0.83
Correlation with age (P-value)	−0.18 (0.341)	−0.21 (0.269)
Cronbach alpha	0.89	0.88
Sub-domains
Social awareness
Raw scores, mean ± SD (min, max)	5.3 ± 2.3 (2, 12)	4.7 ± 1.6 (1, 9)	0.64
T scores, mean ± SD (min, max)	43.8 ± 6.7 (34, 63)	41.9 ± 4.6 (31, 54)	0.64
Correlation with age (P-value)	−0.19 (0.313)	−0.25 (0.185)
Cronbach alpha	0.53	0.37
Social cognition
Raw scores, mean ± SD (min, max)	7.3 ± 2.8 (2, 12)	7.8 ± 3.3 (1, 15)	0.76
T scores, mean ± SD (min, max)	47.8 ± 5.0 (38, 56)	48.6 ± 5.7 (37, 61)	0.76
Correlation with age (P-value)	−0.49 (0.006)	−0.40 (0.031)
Cronbach alpha	0.33	0.57
Social communication
Raw scores, mean ± SD (min, max)	7.6 ± 4.7 (2, 26)	7.1 ± 3.6 (2, 19)	0.65
T scores, mean ± SD (min, max)	43.5 ± 4.9 (37, 63)	43.1 ± 3.7 (37, 56)	0.63
Correlation with age (P-value)	−0.16 (0.405)	−0.10 (0.601)
Cronbach alpha	0.79	0.68
Social motivation
Raw scores, mean ± SD (min, max)	5.9 ± 2.9 (1, 12)	5.6 ± 3.0 (1, 12)	0.93
T scores, mean ± SD (min, max)	48.7 ± 5.6 (39, 60)	48.1 ± 5.7 (39, 60)	0.92
Correlation with age (P-value)	−0.06 (0.734)	−0.11 (0.547)
Cronbach alpha	0.23	0.61
Autistic mannerisms
Raw scores, mean ± SD (min, max)	2.6 ± 3.6 (0, 15)	2.3 ± 3.0 (0, 11)	0.88
T scores, mean ± SD (min, max)	45.3 ± 7.3 (40, 70)	44.6 ± 6.1 (40, 62)	0.88
Correlation with age (P-value)	0.14 (0.477)	0.02 (0.927)
Cronbach alpha	0.83	0.76

¹P-value to test difference between 1^st visit and 2^nd visit

ICC: Intraclass correlations; SD: Standard deviation.