Table 4.
Differences in variables of interest across skin picking disorder (SPD) subtypes.
| Variable |
Class 1 SPD-Absent/Controls (n = 115) |
SPD Subtype 1 (n = 112) |
SPD Subtype 2 (n = 52) |
Statistic – Overall |
Post hoc tests |
|---|---|---|---|---|---|
| Demographic and Clinical Measures | |||||
| Age, yrs | 29.78 (0.937) | 30.244 (0.967) | 32.1 (1.644) | Chi-square = 1.51; df = 2; p = 0.47 (corrected p value = 1) | |
| Sex, proportion female | 0.816 | 0.840 | 0.856 | Chi-square = 0.460; df = 2; P = 0.795 (corrected p value = 1) | |
| Duration of illness, yrs | 17.557 (1.452) | 17.821 (1.103) | 18.095 (1.7) | Chi-square = 0.058; df = 2; P = 0.971 (corrected p value = 1) | |
| ADHD symptoms (Adult ADHD Self-Report Scale Screener total scores) | 1.149 (0.142) | 2.478 (0.182) | 1.834 (0.257) | Chi-square = 33.606; df = 2; p < .001 (corrected p value < .001) | Subtype 1 compared to controls (p < .001) and compared to subtype 2 (p = .041) Subtype 2 compared to controls (p = .02) |
| Impairment due to BFRB (Sheehan Disability Scale total score) | 3.861 (0.482) | 9.817 (0.741) | 5.706 (0.932) | Chi-square = 45.364; df = 2; p < .001 (corrected p value < .001) | Subtype 1 compared to controls (p < .001) and compared to Subtype 2 (p = .001) |
| Short Mood and Feelings Questionnaire | 3.345 (0.386) | 7.221 (0.578) | 4.651 (0.696) | Chi-square = 31.116; df = 2; p < .001 (corrected p value < .001) | Subtype 1 compared to controls (p < .001) and compared to Subtype 2 (p = .005) |
| The Emotion Regulation Questionnaire – Reappraisal Subscale | 28.727 (0.672) | 26.158 (0.707) | 26.748 (1.052) | Chi-square = 7.359; df = 2; p = .025 (corrected p value = .303) | |
| Suppression Subscales | 12.82 (0.495) | 13.742 (0.5) | 13.846 (0.745) | Chi-square = 2.191; df = 2; p = .334 (corrected p value = 1) | |
| Distress Tolerance Scale total score | 56.37 (1.205) | 48.566 (1.334) | 51.701 (1.932) | Chi-square = 19.135; df = 2; p < .001 (corrected p value < .001) | Subtype 1 compared to controls (p < .001) Subtype 2 compared to controls (p = .04) |
| Adult Sensory Profile: Sensory Sensitivity subscale | 30.043 (0.704) | 36.933 (0.816) | 32.874 (1.22) | Chi-square = 40.862 df = 2; p < .001 (corrected p value < .001) | Subtype 1 compared to controls (p < .001) and compared to Subtype 2 (p = .006) Subtype 2 compared to controls (p = .044) |
| Perfectionism (Frost Perfectionism in Adults total score) | 78.104 (2.027) | 90.544 (2.132) | 83.618 (3.028) | Chi-square = 17.894 df = 2; p < .001 (corrected p value = .002) | Subtype 1 compared to controls (p < .001) |
| Comorbidity | |||||
| ADHD diagnosis, proportion meeting diagnostic criteria | 0 | 0.044 | 0 | Chi-square = 5.193 df = 2; p = .075 (corrected p value = .745) | |
| Obsessive Compulsive Disorder (OCD) diagnosis, proportion with diagnosis | 0.035 | 0.080 | 0.019 | Chi-square = 3.588 df = 2; p = .166 (corrected p value = 1) | |
| Family History | |||||
| Family History of OCD, proportion with | 0.009 | 0.035 | 0.039 | Chi-square = 2.685 df = 2; p = .261 (corrected p value = 1) | |
| Family history of Alcohol use disorder, proportion with | 0.122 | 0.248 | 0.196 | Chi-square = 6.387 df = 2; p = .041 (corrected p value = .451) | |
| Family history of Substance use disorder, proportion with | 0.061 | 0.124 | 0.098 | Chi-square = 2.832; df = 3; p = .243 (corrected p value = 1) | |
| Cognitive Measures | |||||
| Barratt Impulsivity Scale total | 56.773 (1.139) | 61.51 (1.08) | 57.582 (1.641) | Chi-square = 9.96 df = 2; p = 0.007 (corrected p value = .089) | |
| Extra-dimensional set-shifting errors | 10.674 (1.044) | 9.063 (0.999) | 10.46 (1.549) | Chi-square = 1.377 df = 2; p = .502 (corrected p value = 1) | |
| Stop-signal reaction times | 232.344 (12.414) | 218.942 (9.266) | 200.741 (8.157) | Chi-square = 5.094 df = 2; p = .078 (corrected p value = .745) | |