Table 1.
Descriptive statistics: Addiction symptoms
| n | % | κ | agreement | |
| Addiction symptoms | ||||
| Urges; cravings | 338 | 67.6 | 0.62 | substantial |
| Escalating severity; tolerance | 239 | 47.8 | 0.39 | fair |
| Physically hazardous NSSI | 191 | 38.2 | 0.62 | substantial |
| Persistent efforts to quit/cut back | 147 | 29.4 | 0.26 | fair |
| NSSI causing interpersonal problems | 137 | 29.4 | 0.36 | fair |
| NSSI despite knowledge of psychological harm | 137 | 27.4 | 0.26 | fair |
| More often or severe than intended | 92 | 27.4 | 0.48 | moderate |
| Failure to fulfill role obligations | 30 | 18.4 | 0.32 | fair |
| Withdrawal | 29 | 6 | 0.48 | moderate |
| Spending a lot of time self-injuring | 28 | 5.8 | 0.16 | poor |
| Giving up social or recreational activities | 25 | 5.6 | 0.43 | moderate |
| Severity categories | ||||
| None (0-1 symptom) | 116 | 23.2 | ||
| Mild (2-3 symptoms) | 230 | 46 | ||
| Moderate (4-5 symptoms) | 134 | 26.8 | ||
| Severe (6+ symptoms) | 20 | 4 | ||
NSSI-adapted DSM-5 SUD criteria (addiction symptoms; addictive features) in descending order of the number of r/selfharm users (n = 500) endorsing each criterion at least once in their posts. κ = Fleiss's kappa statistic, an indicator of intercoder reliability. Interpretation of κ (from Landis & Koch, 1977) is also reported. All values of κ were significantly better than chance agreement at the P < 0.001 level.