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. Author manuscript; available in PMC: 2009 Feb 7.
Published in final edited form as: J Autism Dev Disord. 2008 Feb 12;38(8):1518–1533. doi: 10.1007/s10803-007-0532-8

Table 6.

Frequency and Duration of Repetitive and Stereotyped Behaviors Across Groups

One-tailed contrasts
ASD (n=50) DD (n=25) TD (n=50) ASD-TD ASD-DD
RSB Measure Mean SD Mean SD Mean SD p da p da
RSB with objects
 Frequency 8.04 6.18 3.08 2.61 3.34 3.18 .000 1.00 .000 1.13
 Duration (s) 40.90 39.88 10.32 11.31 15.65 23.72 .000 0.79 .000 1.19
RSB with body
 Frequency 3.16 4.64 0.68 1.22 0.70 1.23 .001 0.84 .001 0.85
 Duration (s) 8.91 12.18 3.14 8.10 2.75 5.18 .001 0.71 .009 0.57
Sensory Behaviors
 Frequency 0.94 2.55 0.20 0.50 0.24 0.77 .034 0.42 .027 0.49
 Duration (s) 8.23 24.34 1.59 4.47 1.80 7.26 .040 0.41 .033 0.46

Note. p -values reflect planned one-tailed contrasts between the ASD group and the other two groups respectively

a

Effect size based on Cohen’s d ≥ .20 is small, .50 is medium, and .80 is large