| http://www.w3.org/ns/prov#value | - First, at least three out of four of the bone conduction thresholds at 500 Hz (B5), 1000 Hz (B1), 2000 Hz (B2), and 4000 Hz (B4) must be less than 25 dB or each of these thresholds must be less than 30 dB. If one of these two conditions occurs, it is then determined whether one of conditions A or B occurs.
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