14.9 percent of children between the ages of 6 and 19 have hearing loss of at least 16 dB in one or both ears. Even unilateral hearing loss (hearing loss in only one ear) has tremendous impact on school performance; research shows anywhere from 25 to 35 percent of children with unilateral hearing loss are at risk of failing at least one grade level.

(According to the Centers for Disease and Control (CDC) USA )