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Table 1 Characteristics of male and female workers exposed to industrial noise (total n = 2280)

From: Sex differences in noise-induced hearing loss: a cross-sectional study in China

Variables Males (n = 1140) Females (n = 1140) P value
Age, mean ± SD 35.0 ± 8.4 35.0 ± 8.4 0.996
Cumulative noise exposure, mean ± SD 92.9 ± 8.8 92.9 ± 8.8 0.920
Body mass index, n (%)    < 0.001
 Normal 643 (56.4) 758 (66.5)  
 Overweight 374 (32.8) 268 (23.5)  
 Obese 83 (7.3) 38 (3.3)  
Hearing protective device use, n (%)    0.028
 < 4 h per day 462 (40.5) 411 (36.1)  
 >= 4 h per day 678 (59.5) 729 (63.9)  
Community noise exposure, n (%)    < 0.001
 No 714 (62.6) 820 (71.9)  
 Yes 426 (37.4) 320 (28.1)  
Personal earphone use, n (%)    0.001
 < 2 h per day 830 (72.8) 897 (78.7)  
 >= 2 h per day 310 (27.2) 243 (21.3)  
Smoking, n (%)    < 0.001
 < 10 cigarettes per day 674 (59.1) 1132 (99.3)  
 >= 10 cigarettes per day 466 (40.9) 8 (0.7)  
Alcohol consumption, n (%)    < 0.001
 < 50 g alcohol per day 793 (69.6) 1116 (97.9)  
 >= 50 g alcohol per day 347 (30.4) 24 (2.1)  
Hearing difficulty, n (%)    0.780
 Never 441 (38.7) 439 (38.5)  
 Sometimes 472 (41.4) 461 (40.4)  
 Often 227 (19.9) 240 (21.1)  
Tinnitus, n (%)    0.307
 No 804 (70.5) 827 (72.5)  
 Yes 336 (29.5) 313 (27.5)  
Low-frequency hearing loss, n (%)   0.010
 No 1041 (91.3) 1074 (94.2)  
 Yes 99 (8.7) 66 (5.8)  
High-frequency hearing loss, n (%)    < 0.001
 No 749 (65.7) 983 (86.2)  
 Yes 391 (34.3) 157 (13.8)  
  1. Males and females were initially matched for age and noise exposure level