Table 2

Association between variables of exposure to noise and hearing loss according to the notch criterion

Variable Normal hearing (n) Notch (n) OR 95% CI
Exposure to noise in employment:
 Medium51521.040.64 to 1.67
 High30240.820.45 to 1.49
Exposure to air blast circuit breaker:
 Protected27231.150.52 to 2.57
 Unprotected1281321.390.74 to 2.61
Exposure to firearms:
 Never exposed1141151.00Reference
 Ever exposed68600.870.57 to 1.35
Exposure to an explosion:
 Never exposed1591471.00Reference
 Ever exposed23281.320.73 to 2.39