Table 3.
Comparison of measures of affect, repetitive behaviour and activity/impulsivity between participants who did and did not engage in self-harm
| Measure Subscale | Median scores for participants | U Score | P value | Effect size r interpreted through Cohen’s d | |
|---|---|---|---|---|---|
| Self-harm N = 20 |
No self-harm N = 63 |
||||
| MIPQ-S | |||||
| Mood | 17.00 | 20.00 | 278.00 | < .001 | − .41 |
| Interest and pleasure | 11.500 | 14.00 | 428.500 | .032 | − .24 |
| MIPQ total score | 29.00 | 20.00 | 344.500 | .002 | − .33 |
| RBQ | |||||
| Stereotyped behaviour | 5.00 | 3.00 | 453.500 | .106 | − .18 |
| Compulsive behaviour | 8.00 | 3.00 | 300.500 | .001 | − .36 |
| Insistence on sameness | 4.00 | 3.00 | 322.000 | .002 | − .34 |
| Restricted preferences | 7.00 | 4.00 | 395.500 | .050 | − .22 |
| Repetitive language | 6.00 | 4.00 | 411.500 | .074 | − .2 |
| RBQ total score | 32.00 | 18.00 | 313.500 | .002 | − .35 |
| TAQ | |||||
| Overactivity | 20.5650 | 10.00 | 275.500 | < .001 | − .41 |
| Impulsivity | 18.500 | 11.00 | 288.500 | < .001 | − .40 |
| Impulsive speech | 9.00 | 5.00 | 322.500 | .002 | − .34 |
| TAQ total score | 47.00 | 25.00 | 254.500 | < .001 | − .44 |
Median scores and Mann–Whitney U statistics are reported. Significant differences (p < .01) are highlighted in bold. Where data violated parametric assumptions effect size r was used as an alternative to standard difference statistics and then interpreted with Cohen’s d (Rosenthal et al. 1994; Fritz et al. 2012). For determining the strength of effect size r as interpreted by Cohen’s d, arbitrary cut-offs were assigned as followed: .1 = small, .3 = medium, .5 = large