摘要
Long term exposure to noise can result in hearing loss. However, it is unclear if the air-craft-generating noise can damage the pilots’ hearing ability in the long run even they wear the protective devices. Thus, we analyzed the hearing ability of the pilots during the routing annual physical evaluation. There were 204 pilot subjects, who divided into 3 groups to exam the hearing ability at 6 different frequencies (500, 1000, 2000, 3000, 4000, and 6000 Hz). The first group was the flight student (n=88), the second group was fighter jet pilots (n=59), and the final group was fighter (propeller-engine) pilots (n=57). The pure tone average (PTA) was higher in Group II (20.8 ± 0.2 dBA) and Group III (20.9 ± 0.2dBA) than Group I (20.0 ± 0.004dBA) (P＜0.01). The audometric drop at high frequency (4000 and 6000Hz) increased in Group II (4000Hz: 25.8 ± 1.5dBA (L) and 26.7 ± 1.6dBA (R), 6000Hz: 30.9 ± 2.1dBA (L)and 31.0 ± 1.5dBA (R))and Group III (4000Hz: 25.5 ± 1.5dBA (L)and 25.8 ± 1.6dBA (R), 6000Hz:28.2 ± 1.8dBA (L)and 29.0 ± 1.8dBA (R)) compared to Group I (4000Hz: 20.1 ± 0.6dBA (L)and 20.1 ± 0.7dBA (R), 6000Hz: 20.9 ± 0.9dBA (L)and 20.6 ± 0.8dBA (R)) (P＜0.01). In addition, the pure tone average or the percent of the pilots who had the hearing damage (hearing was over 25 dBA at 4000 or 6000Hz) increased with pilots’ flight year. We concluded that the fighter pilots developed hearing loss at high frequencies during their flight career.
並列摘要
Long term exposure to noise can result in hearing loss. However, it is unclear if the air-craft-generating noise can damage the pilots’ hearing ability in the long run even they wear the protective devices. Thus, we analyzed the hearing ability of the pilots during the routing annual physical evaluation. There were 204 pilot subjects, who divided into 3 groups to exam the hearing ability at 6 different frequencies (500, 1000, 2000, 3000, 4000, and 6000 Hz). The first group was the flight student (n=88), the second group was fighter jet pilots (n=59), and the final group was fighter (propeller-engine) pilots (n=57). The pure tone average (PTA) was higher in Group II (20.8 ± 0.2 dBA) and Group III (20.9 ± 0.2dBA) than Group I (20.0 ± 0.004dBA) (P＜0.01). The audometric drop at high frequency (4000 and 6000Hz) increased in Group II (4000Hz: 25.8 ± 1.5dBA (L) and 26.7 ± 1.6dBA (R), 6000Hz: 30.9 ± 2.1dBA (L)and 31.0 ± 1.5dBA (R))and Group III (4000Hz: 25.5 ± 1.5dBA (L)and 25.8 ± 1.6dBA (R), 6000Hz:28.2 ± 1.8dBA (L)and 29.0 ± 1.8dBA (R)) compared to Group I (4000Hz: 20.1 ± 0.6dBA (L)and 20.1 ± 0.7dBA (R), 6000Hz: 20.9 ± 0.9dBA (L)and 20.6 ± 0.8dBA (R)) (P＜0.01). In addition, the pure tone average or the percent of the pilots who had the hearing damage (hearing was over 25 dBA at 4000 or 6000Hz) increased with pilots’ flight year. We concluded that the fighter pilots developed hearing loss at high frequencies during their flight career.
延伸閱讀
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