<unk>  is the sound pressure<unk>  produced by an audiometer at a specific frequency. It is measured in decibels with reference to audiometric zero.<unk>  of speech is considered to be impaired when the<unk>  is shifted 25 dB or more.
Hearing level
History of neuroscience
Performance status
Pregnancy category
History of nursing
Lifestories
Social history of viruses
Child development stages