Table 2.
Comparison of NHIL duration, years of working, noise level, cortisol level, auditory thresholds, THI scores and PSQI scores between two groups, mean ± SD or M (P25, P75) or n (%)
| Variables | ONHLPD(n = 57) | Non-ONHLPD(n = 49) | Z/t/χ2 | P-value |
|---|---|---|---|---|
| NHIL duration (year) | 2.0 (1,3) | 1.0 (0.8, 2.0) | −3.419 | 0.001 |
| Years of working (year) | 9.0 (5.8, 14.0) | 10 (6.5,12) | −0.025 | 0.980 |
| Noise level (dB) | 88.05 ± 1.88 | 88.17 ± 1.49 | −0.348 | 0.729 |
| Cortisol (nmol/L) | 396.30 ± 92.23 | 339.08 ± 97.43 | 2.996 | 0.003 |
| Hearing threshold | ||||
| 26∼40 dbHL | 38 (66.7) | 35 (71.4) | 0.522 | 0.913 |
| 41∼60 dbHL | 15 (26.3) | 10 (20.4) | ||
| 61∼80 dbHL | 1 (1.8) | 1 (20) | ||
| >80 dbHL | 3 (5.3) | 3 (6.1) | ||
| THI (score) | ||||
| I level (0∼16) | 0 (0) | 3 (0) | 50.941 | <0.001 |
| II level (18∼36) | 3 (5.3) | 12 (24.5) | ||
| III level (38∼56) | 1 (1.8) | 15 (30.6) | ||
| IV level (58∼76) | 23 (40.4) | 16 (32.7) | ||
| PSQI | ||||
| <7 | 9 (15.8) | 39 (79.6) | 43.289 | <0.001 |
| 8∼21 | 48 (84.2) | 10 (20.4) | ||