| Variables | Category | NSSI | COR (95% CI) | value | Yes | No |
| Age | <25 | 21 | 38 | 0.932 (0.473, 1.834) | 0.838 | 25-30 | 41 | 74 | 0.934 (0.530, 1.645) | 0.813 | >30 | 35 | 59 | 1 | |
| Sex | Male | 39 | 38 | 1 | | Female | 58 | 133 | 0.425 (0.247, 0.731) | 0.002 |
| Marital status | Single | 53 | 105 | 0.707 (0.214, 2.3330) | 0.569 | Married | 35 | 54 | 0.907 (0.267, 3.7086) | 0.876 | Divorced | 4 | 5 | 1.120 (0.196, 6.414) | 0.899 | Widowed | 5 | 7 | 1 | |
| Educational status | BSC | 73 | 129 | 0.5349 (0.260, 1.101) | 0.089 | Diploma | 6 | 25 | 0.227 (0.075, 0.688) | 0.009 | MSC | 18 | 17 | 1 | |
| Working departments | Emergency | 9 | 16 | 0.703 (0.257, 1.923) | 0.493 | ICU | 6 | 7 | 1.071 (0.310, 3.6980) | 0.913 | Medical | 28 | 44 | 0.795 (0.374, 1.6930) | 0.553 | Surgical | 20 | 5 | 1 | | OPD | 26 | 47 | 0.691 (0.324, 1.476) | 0.340 | Pediatric | 8 | 32 | 0.313 (0.118, 0.827) | 0.019 |
| Training | Yes | 60 | 86 | 1.603 (0.965, 2.663) | 0.069 | No | 37 | 85 | 1 | |
| Working experiences | <5 | 71 | 127 | 0.599 (0.273, 1.312) | 0.200 | 5-10 | 12 | 29 | 0.4439 (0.164, 1.195) | 0.108 | >10 | 14 | 15 | 1 | |
| Dirty sharps in working places | Yes | 75 | 109 | 1.939 (1.098, 3.423) | 0.022 | No | 22 | 62 | 1 | |
| IP committee | Yes | 76 | 21 | 1.495 (0.833, 2.684) | 0.1778 | No | 121 | 50 | 1 | |
| Safety box at right places | Yes | 70 | 121 | 1.071 (0.616, 1.862) | 0.808 | No | 27 | 50 | 1 | |
| Universal precaution | Yes | 72 | 120 | 1.224 (0.699, 2.144) | 0.480 | No | 25 | 51 | 1 | |
| Sharp collection box | Yes | 66 | 114 | 1.065 (0.625, 1.812) | 0.818 | No | 31 | 57 | 1 | |
| Needle recapping | Yes | 53 | 65 | 1.964 (1.185, 3.255) | 0.009 | No | 44 | 106 | 1 | |
| Injection environments | Safe | 32 | 49 | 1 | | Unsafe | 65 | 122 | 1.226 (0.716, 2.098) | 0.458 |
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