Item | With NSSI | Without NSSI | χ2/t | P |
---|---|---|---|---|
Gender [n (%)] | Â | Â | 11.120 | 0.001 |
 Male | 382 (43.4) | 754 (50.4) |  |  |
 Female | 499 (56.6) | 741 (49.6) |  |  |
Age (\(\overline{x}\) ± s) | 13.61 ± 1.017 | 13.69 ± 0.960 | − 1.883 | 0.060 |
Grade [n (%)] | Â | Â | 17.594 | <0.001 |
 Junior Year 1 | 324 (36.8) | 431 (28.8) |  |  |
 Junior Year 2 | 313 (35.5) | 564 (37.7) |  |  |
 Junior Year 3 | 244 (27.7) | 500 (33.4) |  |  |
Growing environment [n (%)] | Â | Â | 10.688 | 0.001 |
 Urban | 81 (9.2) | 205 (13.7) |  |  |
 Rural | 800 (90.8) | 1290 (86.3) |  |  |