Number of subjects analysed | 60 | 122 | 146 | 328 |
Number of exams, mean (SD) | 3.7 (0.6) | 3.3 (0.8) | 3.4 (0.8) | 3.4 (0.8) |
Male, n (%) | 32 (53.3) | 112 (91.8) | 240 (88.9) | 272 (82.9) |
Age, mean (SD) | 27.3 (4.2) | 27.2 (6.7) | 27.8 (6.8) | 27.5 (6.4) |
Prior occupational noise, n (%) | 36 (60) | 102 (79.6) | 112 (76.7) | 250 (76.1) |
Prior non-occup. noise, n (%) | 26 (43.3) | 101 (81.4) | 118 (80.8) | 245 (74.7) |
Number of ears analysed | 114 | 238 | 280 | 632 |
BL audiogram ⩽10 dB, n (%)* | 78 (68.4) | 132 (55.5) | 153 (54.6) | 363 (57.4) |
BL audiogram 10–20 dB, n (%) | 31 (27.2) | 73 (30.7) | 74 (26.4) | 178 (28.2) |
BL audiogram >20 dB, n (%) | 5 (4.4) | 33 (13.8) | 53 (18.9) | 91 (14.4) |