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Table 2 Characteristics of noise-exposed workers

From: A risk model and nomogram for high-frequency hearing loss in noise-exposed workers

Variable All subjects Training cohort Validation cohort
(n = 32,121) (n = 25,732) (n = 6389)
n % n % n %
Sex
 Male 23,661 73.66 6828 73.46 1632 74.46
 Female 8460 26.34 18,904 26.54 4757 25.54
Age (years)
  < 25 1908 5.94 1525 5.93 383 5.99
 25–29 4191 13.05 3369 13.09 822 12.87
 30–34 3888 12.10 3120 12.12 768 12.02
 35–39 4559 14.19 3675 14.28 884 13.84
 40–44 8868 27.61 7085 27.53 1783 27.9
  ≥ 45 8707 27.11 6958 27.04 1749 27.38
NED (years)
 0–4 13,511 42.06 10,840 42.13 2671 41.81
 5–9 8137 25.33 6521 25.34 1616 25.29
 10–14 3742 11.65 2967 11.53 775 12.13
 15–19 2006 6.25 1625 6.32 381 5.96
 20–24 2775 8.64 2227 8.65 548 8.58
 25–29 1441 4.49 1152 4.48 289 4.52
  ≥ 30 509 1.58 400 1.55 109 1.71
Industry type
 Manufacturing 23,295 72.52 18,673 72.57 4622 72.34
 Construction 294 0.92 232 0.90 62 0.97
 Mining 3341 10.40 2670 10.38 671 10.51
 Others a 5191 16.16 4157 16.15 1034 16.18
Enterprise type
 SOE 9661 30.08 7762 30.16 1899 29.72
 FOE 2446 7.61 1978 7.69 468 7.33
 POE 20,014 62.31 15,992 62.15 4022 62.95
  1. Abbreviations: NED noise exposure duration, FOE foreign-owned enterprise, SOE state-owned enterprise, POE private-owned enterprise
  2. aOthers included the transportation industry, storage industry, postal industry, agricultural industry, and fishery and animal husbandry industry