Table 3.
NSSI Characteristics by NSSI Diagnostic Status
| NSSI History, Not Disorder (n = 111) |
NSSI Disorder (n = 14) |
t/χ2 | df | res/Φ/V | |
|---|---|---|---|---|---|
| Age of NSSI onset | 15.60 (5.65) | 14.00 (5.63) | −1.00 | 121 | 0.09 |
| Number of days past year | 6.38 (35.89) | 86.64 (134.47) | 5.11 *** | 123 | 0.42 |
| Lifetime NSSI frequency | 712.65 (5962.38) | 359.50 (609.36) | −0.22 | 114 | 0.02 |
| Interfere with functioning (% Yes) | 6.3 | 28.6 | 8.17* | 2 | 0.26 |
| Want to stop (% Yes) | 57.7 | 85.7 | 4.15 | 2 | 0.18 |
| FASM | |||||
| Autonomic Negative | 1.81 (1.88) | 3.79 (1.67) | 3.73*** | 122 | 0.32 |
| Autonomic Positive | 2.41 (2.51) | 5.00 (2.00) | 3.72*** | 121 | 0.32 |
| Social Negative | 0.96 (1.91) | 0.64 (1.01) | −0.60 | 123 | 0.05 |
| Social Positive | 4.30 (7.59) | 3.15 (2.78) | −0.54 | 116 | 0.05 |
| NSSI Methods | |||||
| Number of NSSI Methods | 2.10 (1.54) | 2.75 (1.42) | 1.39 | 115 | 0.13 |
| % Cut | 56.0 | 78.6 | 2.61 | 1 | 0.15 |
| % Carve | 25.2 | 16.7 | 0.43 | 1 | 0.06 |
| % Hit | 43.0 | 50.0 | 0.22 | 1 | 0.04 |
| % Interfere with wound healing | 19.6 | 25.0 | 0.19 | 1 | 0.04 |
| % Burn | 15.1 | 33.3 | 2.55 | 1 | 0.15 |
| % Insert objects under skin | 3.7 | 0.0 | 0.46 | 1 | 0.06 |
| % Bite | 13.1 | 33.3 | 3.45 | 1 | 0.17 |
| % Skin pick | 14.0 | 16.7 | 0.06 | 1 | 0.02 |
| % Scratch | 18.9 | 25.0 | 0.26 | 1 | 0.05 |
Note. Unless otherwise specified, values in cells represent means, and values in parentheses represent standard deviations. NSSI = Non-suicidal self-injury. FASM = Functional Assessment of Self-Mutilation.
*
p < 0.05,
**
p < 0.01,
***
p < 0.01,