Pair number, gender, test ear, SOAE frequency (Hz), age (years), and average threshold (dB SPL) for SOAE+ and SOAE− subjects, respectively. Threshold values are an average for each subject at 11 frequencies centered on the SOAE frequency. Note that pairs 3 and 10 used the same female SOAE+ subject (the two ears were tested during separate experimental sessions). Pairs 5 and 8 also used the same female SOAE+ subject (both right ear, tested on separate days for each frequency). There was one male-female match (pair 17). Aside from gender, this pair was matched on all other variables. Age and thresholds of the SOAE+ subject in the pair are presented first in the last two columns.