Table 1.

Descriptive Statistics of Individuals with ASD and Family Background (all measured at Time 1).

	Alive (n=380)	Deceased (n=26)	F-valuea
Individuals with ASD
Age	21.4 (8.9) [10, 48]	29.6 (12.5) [11, 52]	t = 4.38***
Sex (percentile of males)	275 (72.4%)	22 (84.6%)	Chi-sq = 1.86
Intellectual Disability	263 (69.2%)	21 (80.8%)	Chi-sq = 1.55
Health rating
Excellent	141 (37.1%)	4 (15.4%)	Chi-sq = 10.3**
Good	187 (49.2%)	13 (50.0%)
Fair/poor	52 (13.7%)	9 (34.6%)
Number of behavior problems (SIB-Rbitems)	4.8 (2.0) [0, 8]	4.3 (2.0) [1, 8]	F = 0.05
ADI-Rc Lifetime Impairments in Social Reciprocity	25.0 (3.9) [10, 30]	27.2 (1.9) [24, 30]	F = 4.14*
ADI-Rc Lifetime Impairments in Non-verbal Communication	12.1 (2.3) [3, 14]	12.9 (1.8) [7, 14]	F = 0.64
ADI-Rc Lifetime Repetitive Behavior and Interests	6.9 (2.5) [0, 12]	6.6 (2.3) [3, 11]	F = 0.08
W-ADLd	19.8 (6.6) [3, 34]	17.3 (6.6) [3, 34]	F = 7.07**
Seizure disorder
No seizures	294 (78.0%)	17 (64.5%)	Chi-sq = 5.02
Has seizures	86 (22.0%)	9 (35.5%)
Family Characteristics
Maternal age	50.7 (10.0) [ 32, 81]	58.3 (12.7) [37, 79]	t = 3.69***
Marital status of mother	290 (78.8%)	19 (73.1%)	Chi-sq = 0.48
Maternal education (college graduate or higher)	174 (45.8%)	9 (34.6%)	Chi-sq = 1.02
Household incomee	9.7 (3.4) [2, 13]	8.8 (2.9) [3, 13]	F = 0.38
Number of children in the family	2.83 (1.3) [1, 8]	3.31 (1.4) [2, 7]	F = 1.14

^*p < 0.05

^**p < 0.01

^***p < 0.001

^a.From ANCOVA with Time 1 age as a covariate, unless other statistics are reported.

^b.SIB-R – Scales of Independent Behavior-Revised.

^c.ADI-R – Autism Diagnostic Interview – Revised.

^d.W-ADL –Waisman Activities of Daily Living

^e.Based on the original scale: (1) 0 - $4,999; (2) $5,000 - $9,999; ….(8) $35,000 - $39,999; (9) $40,000 - $44,999; (10) $45,000 - $49,999; (11) $50,000 - $59,999; (12) $60,000 - $69,999; (13) $70,000+