Table 4 Characteristics of the HFHL workers in the training cohort and validation cohort
From: A risk model and nomogram for high-frequency hearing loss in noise-exposed workers
Variable | Training cohort (n = 25,732) | P# | Validation cohort (n = 6389) | P# | ||
|---|---|---|---|---|---|---|
n | Positive cases (%) | n | Positive cases (%) | |||
Sex |  |  | < 0.001 |  |  | < 0.001 |
 Male | 87.77 | 2004 (90.11) |  | 1632 | 45 (2.76) |  |
 Female | 12.23 | 220 (9.89) |  | 4757 | 502 (10.55) |  |
Age (years) |  |  | < 0.001 |  |  | < 0.001 |
  < 25 | 1525 | 23 (1.51) |  | 383 | 5 (1.31) |  |
 25–29 | 3369 | 96 (2.85) |  | 822 | 21 (2.56) |  |
 30–34 | 3120 | 129 (4.13) |  | 768 | 28 (3.65) |  |
 35–39 | 3675 | 296 (8.05) |  | 884 | 69 (7.81) |  |
 40–44 | 7085 | 664 (9.37) |  | 1783 | 181 (10.15) |  |
  ≥ 45 | 6958 | 1016 (28.99) |  | 1749 | 243 (30.00) |  |
NED (years) |  |  | < 0.001 |  |  | < 0.001 |
 0–4 | 10,840 | 708 (6.53) |  | 2671 | 165 (6.18) |  |
 5–9 | 6521 | 549 (8.42) |  | 1616 | 132 (8.17) |  |
 10–14 | 2967 | 324 (10.92) |  | 775 | 76 (9.81) |  |
 15–19 | 1625 | 175 (10.77) |  | 381 | 57 (14.96) |  |
 20–24 | 2227 | 246 (11.05) |  | 548 | 66 (12.04) |  |
 25–29 | 1152 | 156 (13.54) |  | 289 | 33 (11.42) |  |
  ≥ 30 | 400 | 66 (16.50) |  | 109 | 18 (16.51) |  |
Industry type |  |  | < 0.001 |  |  | < 0.001 |
 Manufacturing | 18,673 | 1486 (7.96) |  | 4622 | 352 (7.62) |  |
 Construction | 232 | 271 (1.64) |  | 62 | 7 (11.29) |  |
 Mining | 2670 | 472 (17.68) |  | 671 | 113 (16.84) |  |
 Others | 4157 | 239 (5.75) |  | 1034 | 75 (7.25) |  |
Enterprise type |  |  | < 0.001 |  |  | < 0.001 |
 SOE | 7762 | 524 (6.75) |  | 1899 | 130 (6.85) |  |
 FOE | 1978 | 109 (5.51) |  | 468 | 32 (6.84) |  |
 POE | 15,992 | 1591 (9.95) |  | 4022 | 385 (9.57) |  |