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Table 2 Hearing loss at high frequencies and correlation with noise levels among the three groups

From: High-frequency hearing loss, occupational noise exposure and hypertension: a cross-sectional study in male workers

Variable High HL group Median HL group Low HL group P-value Spearman's rank correlation
  Median (IRQ) Median (IRQ) Median (IRQ)   Coefficient P-value
Hearing loss (dB) at 4000 Hz      
   Left ear 35.0 (30.0)b, c 20.0 (15.0)b 0 (10.0) < 0.001a 0.169 < 0.001
   Right ear 35.0 (35.0)b, c 20.0 (10.0)b 0 (5.0) < 0.001a 0.149 < 0.001
   Mean of both ears 35.0 (27.5)b, c 17.5 (10.0)b 0 (7.5) < 0.001a 0.159 < 0.001
Hearing loss (dB) at 6000 Hz      
   Left ear 40.0 (20.0)b, c 20.0 (10.0)b 0 (10.0) < 0.001a 0.172 < 0.001
   Right ear 45.0 (30.0)b, c 20.0 (10.0)b 0 (5.0) < 0.001a 0.127 < 0.001
   Mean of both ears 42.5 (20.0)b, c 17.5 (7.5)b 0 (7.5) < 0.001a 0.145 < 0.001
  1. dB = decibel; dBA = A-weighted decibel; HL = hearing loss; IRQ = interquartile range; SD = standard deviation.
  2. a Kruskal-Wallis test of the difference between three groups. b Mann-Whitney test for a significant difference (p < 0.050) compared with the low-hearing-loss group. c Mann-Whitney test for a significant difference (p < 0.050) compared with the median-hearing-loss group.