Table 3.
Descriptive statistics.
| Total (N=326) | Range | 1 (n=8) | 2 (n=67) | 3 (n=12) | 4 (n=231) | Statistical Testing | Group Differences | |
|---|---|---|---|---|---|---|---|---|
| Demographics | ||||||||
| Gender | ||||||||
| Female | 244 (75%) | - | 4 (50%) | 51 (76%) | 10 (83%) | 179 (75%) | χ2(3,N=326)=3.14, p = 0.37 | N/A |
| Male | 82 (25%) | 4 (50%) | 16 (24%) | 2 (17%) | 60 (25%) | |||
| Agea | 21.33 (4.16) | 18–51 | 21.75 (3.66) | 21.04 (4.30) | 23.17 (5.08) | 21.31 (4.08) | F3,322=0.92, p = 0.43 | N/A |
| Ethnicity | ||||||||
| Hispanic or Latinx | 123 (38%) | - | 4 (50%) | 22 (33%) | 6 (50%) | 91 (39%) | χ2(3,N=3i8)=2.10, p = 0.55 | N/A |
| Not Hispanic or Latinx | 203 (62%) | 4 (50%) | 45 (67%) | 6 (50%) | 140 (61%) | |||
| Race | ||||||||
| Caucasian | 224 (69%) | - | 7 (88%) | 41 (61%) | 9 (75%) | 167 (72%) | χ2(18,N=318)=27.03, p = 0.08 | N/A |
| Black or African-Amer. | 25(11%) | 0 (0%) | 5 (8%) | 3 (25%) | 28 (12%) | |||
| Asian or Asian-Amer. | 15 (5%) | 0 (0%) | 8 (12%) | 0 (0%) | 7 (3%) | |||
| Another Race | 22 (8%) | 1 (12%) | 7 (10%) | 0 (0%) | 14 (6%) | |||
| Multiracial | 21 (7%) | 0 (0%) | 6 (9%) | 0 (0%) | 15 (7%) | |||
| Frequency by Type of NSSI Behavior | ||||||||
| Scratching/Skin Piercing | 11.40 (30.22) | 0-270 | 9.25 (19.65) | 29.01 (52.93) | 27.92 (47.23) | 5.70 (14.90) | F3,322 = 12.91, p < 0.001 | 2 > 4 |
| Banging/Bruising | 6.00 (15.31) | 0-100 | 15.13 (22.90) | 13.75 (26.70) | 3.50 (5.68) | 3.65 (8.93) | F3,322 = 9.32, p < 0.001 | 2 > 4 |
| Cutting | 5.60 (14.66) | 0-108 | 22.63 (39.06) | 11.49 (18.91) | 5.25 (11.54) | 3.39 (10.90) | F3,322 = 9.75, p < 0.001 | 1, 2 > 4 |
| Burning | 0.75 (2.71) | 0-20 | 15.75 (3.99) | 0.76 (1.85) | 0.92 (1.83) | 0.23 (0.79) | F3,322 = 383.64, p < 0.001 | 1 > 2, 3 |
| Using Implements | 0.05 (0.29) | 0-3 | 0.00 (0.00) | 0.00 (0.00) | 1.33 (0.78) | 0.00 (0.00) | F3,322 = 330.82, p < 0.001 | 3 > 1, 2, 4 |
| Emotion Regulation | 2.38 (0.65) | 1.11-4.42 | 2.39 (0.78) | 3.33 (0.39) | 2.46 (0.45) | 2.11 (0.43) | F3,325 = 140.38, p < 0.001 | 2 > 1, 3, 4 |
| Difficulties | 3 > 4 | |||||||
| Non-acceptance | 2.31 (0.98) | 1.00-5.00 | 2.46 (1.17) | 3.35 (0.96) | 2.50 (0.80) | 2.00 (0.76) | F3,321 = 48.10, p < 0.001 | 2 > 4 |
| Goal-directed activities | 3.01 (0.98) | 1.00-5.00 | 2.25 (0.98) | 4.04 (0.61) | 2.73 (0.74) | 2.76 (0.87) | F3,321 = 45.62, p < 0.001 | 2 > 1, 3, 4 |
| Impulse control | 2.13 (0.91) | 1.00-4.83 | 2.17 (1.06) | 3.40 (0.72) | 2.17 (0.74) | 1.78 (0.60) | F3, 321 = 111.86, p < 0.001 | 2 > 1, 3, 4 |
| Awareness | 2.37 (0.80) | 1.00-4.67 | 2.98 (0.73) | 2.61 (0.75) | 2.74 (0.77) | 2.26 (0.79) | F3,321 = 6.11, p < 0.001 | n.s.1 |
| Coping strategies | 2.30 (0.90) | 1.00-5.00 | 2.14 (0.96) | 3.60 (0.65) | 2.26 (0.66) | 1.94 (0.57) | F3,321 = 132.42, p < 0.001 | 2 > 1, 3, 4 |
| Emotional clarity | 2.29 (0.80) | 1.00-5.00 | 2.43 (1.12) | 2.94 (0.74) | 2.50 (0.57) | 2.09 (0.72) | F3,3215 = 24.71, p < 0.001 | 2 > 4 |
Note: N=326. All total and class values represent M(SD) for continuous variables and n(%) for categorical variables, unless otherwise denoted.
1
Omnibus testing suggested significant differences between classes, but these differences did not remain significant after modified Bonferroni correction.