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. 2020 Feb 19;21(98):17–24. doi: 10.4103/nah.NAH_16_18

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)