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Table 3 Different characteristics of the BHFTA among the subjects (n = 32,121)

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

Variable BHFTA [n (%)] P *
<25a 25–39 40–79 b ≥80c  
Sex      < 0.001
 Female 5957 (70.41) 2160 (25.53) 332 (3.92) 11 (0.13)  
 Male 13,995 (59.15) 6777 (28.64) 2809 (11.87) 80 (0.34)  
Age (years)      < 0.001
  < 25 1443 (75.63) 428 (22.43) 37 (1.94) 0 (0.00)  
 25–29 3044 (72.63) 1001 (23.88) 145 (3.46) 1 (0.02)  
 30–34 2691 (69.21) 991 (25.49) 204 (5.25) 2 (0.05)  
 35–39 2824 (61.94) 1292 (28.34) 432 (9.48) 11 (0.24)  
 40–44 5257 (59.28) 2615 (29.49) 966 (10.89) 30 (0.34)  
  ≥ 45 4693 (53.90) 2610 (29.98) 1357 (15.59) 47 (0.54)  
NED (years)      < 0.001
 0–4 8937 (66.15) 3564 (26.38) 990 (7.33) 20 (0.15)  
 5–9 5217 (64.11) 2148 (26.4) 754 (9.27) 18 (0.22)  
 10–14 2177 (58.18) 1079 (28.83) 469 (12.53) 17 (0.45)  
 15–19 1156 (57.63) 576 (28.71) 264 (13.16) 10 (0.50)  
 20–24 1508 (54.34) 898 (32.36) 362 (13.05) 7 (0.25)  
 25–29 699 (48.51) 517 (35.88) 215 (14.92) 10 (0.69)  
  ≥ 30 258 (50.69) 155 (30.45) 87 (17.09) 9 (1.77)  
Industry type      < 0.001
 Manufacturing 14,901 (63.97) 6178 (26.52) 2168 (9.31) 48 (0.21)  
 Construction 107 (36.39) 147 (50.00) 39 (13.27) 1 (0.34)  
 Mining 1448 (43.34) 1284 (38.43) 582 (17.42) 27 (0.81)  
 Others 3496 (67.35) 1328 (25.58) 352 (6.78) 15 (0.29)  
Enterprise type      < 0.001
 SOE 5433 (56.24) 3328 (34.45) 880 (9.11) 20 (0.21)  
 FOE 1626 (66.48) 659 (26.94) 160 (6.54) 1 (0.04)  
 POE 12,893 (64.42) 4950 (24.73) 2101 (10.5) 70 (0.35)  
  1. Abbreviations: BHFTA binaural high-frequency threshold average, NED noise exposure duration, FOE foreign-owned enterprise, SOE state-owned enterprise, POE private-owned enterprise
  2. Footnote. a BHFTA ≤25 dB, defined as a normal hearing level; b BHFTA ≥40 dB, defined as the cut-off point for HFHL; c BHFTA ≥80 dB, defined as severe HFHL
  3. * P-value was analysed by the chi-square test, with significance defined at < 0.05