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For tests at 73 dB peSPL, normalized GD vs HL of older female ears (marker ×). Regression model (solid line) with 95% CI (dotted lines). Text lists model slope m and For comparison, median GD (horizontal dashed line) and IQR (gray shading) of younger normal group are shown; median GD listed (left of line). Five panels show data for older females at octaves 0.5–8 kHz. Lower right panel shows GD vs HL at 2.0 kHz for older males (marker ○).
