Table 5.

Mean Duration in Seconds of Individual Repetitive and Stereotyped Behaviors across Groups

RSB Item	ASD (n=50)		DD (n=25)		TD (n=50)		Pairwise effect size (d)a
	Mean	SD	Mean	SD	Mean	SD	ASD-TD	ASD-DD
RSB with objects
Bang/Taps	12.21	16.43	4.12	4.46	6.39	8.92	0.46	0.77
Rocks/Flips	5.01	10.29	3.13	6.68	0.78	2.26	0.67	0.22
Shakes	10.68	41.18	5.06	7.58	2.67	4.04	0.35	0.23
Swipes	1.91	5.48	0.43	1.89	0.22	1.58	0.48	0.40
Rubs/Squeezes	2.91	10.79	2.12	6.90	0.66	2.01	0.35	0.09
Linesup/Stacks	0.00	0.00	0.44	1.74	0.47	3.01	−0.31	−0.51
Collects	2.88	7.86	0.55	1.97	1.80	6.54	0.15	0.47
Spins/Wobbles	5.57	18.53	0.41	2.05	0.35	1.83	0.51	0.50
Rolls	1.61	4.70	0.37	1.87	0.00	0.00	0.69	0.38
Moves/Places	0.74	2.32	0.71	3.24	0.04	0.28	0.54	0.01
Clutches	13.86	31.30	1.16	5.30	7.87	22.00	0.22	0.69
RSB with body
Bangs Surface	4.03	8.33	1.02	2.47	0.63	1.97	0.66	0.56
Pats Body	0.22	0.72	0.23	0.80	0.03	0.18	0.42	−0.01
Rocks/Swivels	0.49	2.05	0.10	0.49	0.43	2.51	0.03	0.31
Flaps	1.44	3.40	3.35	9.83	1.16	4.28	0.07	−0.29
Rubs Body	2.71	7.74	0.50	2.48	1.76	4.32	0.16	0.43
Stiffens	2.17	5.02	1.62	7.71	0.36	1.39	0.56	0.09
Sensory behaviors
Licks	0.10	0.37	0.46	1.84	0.02	0.15	0.31	−0.33
Sniffs/Smells	0.00	0.00	0.10	0.52	0.00	0.00	0.00	−0.38
Feels/Touches	0.49	2.10	0.13	0.66	0.05	0.34	0.36	0.26
Fixates	0.28	1.05	0.07	0.34	0.04	0.28	0.36	0.30
Covers Ears	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
Sucks Fingers	7.47	23.81	1.39	4.23	1.71	7.27	0.37	0.43

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