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. Author manuscript; available in PMC: 2015 Jan 1.
Published in final edited form as: Neuropsychologia. 2013 Nov 21;53:137–145. doi: 10.1016/j.neuropsychologia.2013.11.008

Table 1.

Table 1a. Demographic characteristics of the longitudinal study sample.
ASD TDC Total
Number of participants 81 56 137
Age in yearsa, Mean (SD) 18.5 (6.9) 19.8 (7.3) 19.0 (7.0)
 Age range 6.3–38.9 6.9–39.8 6.3–39.8
Full Scale IQa Mean (SD) 101.9 (16.4) 117.3 (14.2) 108.2 (17.3)
 Full Scale IQ range 61–137 68–152 61–152
Verbal IQa Mean (SD) 101.3 (23.5) 116.1 (14.2) 107.0 (21.5)
 Verbal IQ range 58–138 84–140 58–140
Performance IQa Mean (SD) 100.2 (16.8) 112.2 (17.8) 104.9 (18.1)
 Performance IQ range 66–127 77–155 66–155
Processing speed assessments per participant, Mean (SD) 1.6 (0.7) 1.2 (0.4) 1.4 (0.6)
 Participants with 1 Assessment 43 45 88
 Participants with 2 Assessments 31 11 42
 Participants with 3 Assessments 7 0 7
Inter-Assessment Interval b (years), Mean (SD) 6.0 (2.1) 5.1 (0.7) 5.9 (1.9)
Table 1b. Demographic characteristics of the DTI longitudinal study subsample.
ASD TDC Total
Number of participants 67 54 122
Age in yearsa, Mean (SD) 20.4 (6.5) 20.2 (7.1) 20.3 (6.8)
 Age range 10.6–36.9 6.9–39.8 6.9–39.8
Full Scale IQa Mean (SD) 103.2 (15.8) 117.6 (14.4) 109.6 (16.8)
 Full Scale IQ range 61–137 78–152 61–152
Verbal IQa Mean (SD) 104.9 (21.4) 113.2 (15.1) 109.8 (18.2)
 Verbal IQ range 58–138 84–140 58–140
Performance IQa Mean (SD) 107.7 (15.5) 113.7 (18.6) 111.2 (17.5)
 Performance IQ range 73–127 77–155 73–155
DTI scans per participant, Mean (SD) 1.5 (0.5) 1.3 (0.5) 1.4 (0.5)
 Participants with 1 Scan 44 43 86
 Participants with 2 Scans 23 11 36
Inter-Scan Intervalc (years), Mean (SD) 5.4 (0.7) 5.0 (0.8) 5.2 (0.7)
a

Defined as mean for each individual then averaged across each group.

b

Interval between Time 0, Time 1, and Time 3.

c

Interval between Time 1 and Time 3.

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