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Fig. 1 | Pediatric Rheumatology

Fig. 1

From: Early detection of sensorineural hearing loss in Muckle-Wells-syndrome

Fig. 1

World Health Organization (WHO) definition of functional disability associated with hearing loss and frequencies of daily noises. The graph depicts common sources of noises including their frequencies and loudness. The WHO definition defines five severity grades of hearing impairment based on the 4PTA of the patient’s better ear. 4PTA captures the most relevant frequencies for speech discrimination at 0.5, 1, 2, and 4 kHz. Hearing impairment grades II to IV are considered disabling. Profound hearing impairment constitutes deafness.

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