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Table 4 Comparisons of threshold changes between SNHL and CHL ear during follow-up period by age

From: Comparisons of hearing threshold changes in male workers with unilateral conductive hearing loss exposed to workplace noise: a retrospective cohort study for 8 years

  Age < 50 years (N = 42) Age ≥ 50 years (N = 36)
Difference of Air conduction Difference of Bone conduction Difference of Air-bone gap Difference of Air conduction Difference of Bone conduction Difference of Air-bone gap
kHz Meana SDd p Meanb SDd p Meanc SDd p Meana SDd p Meanb SDd p Meanc SDd p
0.5 −2.0 8.7 0.136 −1.9 8.6 0.158 −0.1 5.9 0.875 0.7 6.8 0.544 −0.3 19.4 0.925 1.0 20.4 0.771
1 −3.7 9.5 0.017 −4.0 9.6 0.011 0.3 5.3 0.729 2.1 9.4 0.180 −0.9 9.9 0.582 3.1 8.7 0.042
2 −2.5 9.8 0.110 −2.3 9.1 0.113 −0.2 6.7 0.837 1.7 8.9 0.268 0.7 11.2 0.724 1.0 7.1 0.404
3 1.4 11.2 0.420 1.9 9.7 0.220 −0.5 8.6 0.735 1.8 8.2 0.208 1.0 8.7 0.481 0.7 6.6 0.518
4 2.5 10.8 0.134 1.3 7.3 0.271 1.3 7.7 0.283 4.1 9.5 0.015 0.4 7.0 0.740 3.7 7.3 0.005
6 0.5 15.0 0.838 - - - - - - 1.0 10.8 0.593 - - - - - -
  1. p-value was calculated by paired t-test; aMean, difference of air conduction threshold (2013-2006) at SNHL ear vs. difference of air conduction threshold (2013-2006) at CHL ear; bMean, difference of bone conduction threshold (2013-2006) at SNHL ear vs. difference of bone conduction threshold (2013-2006) at CHL ear; cMean, average of air-bone gap; dSD, standard deviation