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(a–d) Wisconsin Age-Related Hearing Impairment Classification Scale levels by ear and examination. EHLS = Epidemiology of Hearing Loss Study; EHLS1 = EHLS that occurred in 1993–1995; EHLS2 = EHLS that occurred in 1998–2000; EHLS3 = EHLS that occurred in 2003–2005; EHLS4 = EHLS that occurred in 2009–2010.
