Questionnaire Audiometry | Hearing difficulty | No difficulty | Total |

Hearing loss | 1125 (A) | 1876 (B) | 3001 (A+B) |

Normal | 733 (C) | 10 611 (D) | 11 344 (C+D) |

Total | 1858 (A+C) | 12 487 (B+D) | 14 345 (A+B+C+D) |

Percentage of discrepancy (%)=18.2% [(B+C) / (A+B+C+D)].

Underestimation of hearing impairment=62.5% [B / (A+B)].

Overestimation of hearing impairment=39.5% [C / (A+C)].