. Author manuscript; available in PMC: 2018 Mar 12.

Published in final edited form as: J Autism Dev Disord. 2017 Dec;47(12):3967–3982. doi: 10.1007/s10803-017-3278-y

Table 8.

Differential Attrition

Time 1 Variable	Returned at Time 2 M (SD)	Did Not Return at Time 2 M (SD)	Difference Between Groups
Age	26.65 (4.55)	25.80 (4.91)	t(387) = −1.751, p = .081
CARS Total Score	32.56 (5.50)	33.34 (5.04)	t(372) = 1.400, p = .162
MSEL Visual Reception DQ	65.52 (20.09)	66.43 (18.85)	t(321) = 0.417, p = .677
Time 1 Variable	Returned at Time 2Frequency (%)	Did Not Return at Time 2Frequency (%)
Gender
Male	178 (82%)	124 (73%)	X²(1, N = 389) = 4.607, p = .032
Female	40 (18%)	47 (27%)
Total	218	171
Ethnicity
White	173 (79%)	98 (57%)	X²(6, N = 389) = 28.817, p< .001
Black	8 (4%)	15 (9%)
Hispanic/Latino	17 (8%)	16 (9%)
Asian	7 (3%)	8 (5%)
Biracial	5 (2%)	7 (4%)
Other	0 (0%)	2 (1%)
Unknown	8 (4%)	25 (15%)
Total	218	171
Diagnosis
AD	110 (50%)	100 (58%)	X²(2, N = 389) = 4.655, p = .098
PDD-NOS	83 (38%)	61 (36%)
ASD-Low MA	25 (12%)	10 (6%)
Total	218	171