1.

Distribution of ABR test results at ages 8, 18, and 22 months, and in 22 month old noise-exposed UM-HET4 mice, evaluated at frequencies of 4, 12, 24, and 48 kHz. Box boundaries indicate 25th and 75th percentiles, with the median indicated by the line in the box center. Whiskers indicate 10th and 90th percentiles, and circles indicate individual mice whose scores were outside the 10 – 90th percentile range.