Characteristics | Total N = 122 | Groups With NS Without NS | p-value | |
---|---|---|---|---|
Sex | Â | Â | Â | Â |
 Women  Men | 88(72.1) 34(27.9) | 21(23.9) 7(20.6) | 67(76.1) 27(79.4) | 0.813 |
Age | 36.1 ± 7.8 | 37.2 ± 8.2 | 35.7 ± 7.7 | 0.033 |
Marital status | Â | Â | Â | Â |
 Married  Single | 97(79.5) 25(20.5) | 22(22.7) 6(24.0) | 75(77.3) 19(76.0) | 1.000 |
Education | Â | Â | Â | Â |
 AD*  Bachelor  Master | 16(13.1) 96(78.7) 10(8.2) | 5(31.3) 20(20.8) 3(47.9) | 11(68.8) 76(79.2) 7(70.0) | 0.432 |
Graduation | Â | Â | Â | Â |
 >20 years  10–20 years  <10 years | 37(30.4) 53(43.4) 32(26.2) | 14(37.8) 9(17.0) 5(15.6) | 23(62.2) 44(83.0) 27(84.4) | 0.031 |
Refractive disorders of eye | 50(41.0) | 8(16.0) | 42(84.0) | 0.189 |
Work experience | Â | Â | Â | Â |
 <5 years  5–10 years  >10 years | 30(24.6) 27(22.1) 65(53.3) | 7(23.3) 3(11.1) 18(27.7) | 23(76.7) 22(88.8) 47(72.3) | 0.040 |
Shift-work | Â | Â | Â | Â |
 >10 h  <10 h  Missing | 89(73.0) 19(15.5) 14(11.5) | 22(24.7) 4(21.1) 2(14.3) | 67(75.3) 15(78.9) 12(85.7) | 1.000 |
Job category | Â | Â | Â | Â |
 Nurse  Technician | 106(86.9) 16(13.1) | 21(19.8) 4(25.0) | 85(80.2) 12(75.0) | 0.162 |
Hours of working/week | 49.1 ± 0.8 | 48.6 ± 0.5 | 50.2 ± 0.6 | 0.321 |
Number of night shifts/month | 2.1 ± 0.4 | 2.0 ± 0.3 | 2.2 ± 0.5 | 1.000 |