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Fig. 1 | BMC Geriatrics

Fig. 1

From: Blood levels of nicotinic acid negatively correlate with hearing ability in healthy older men

Fig. 1

Correlation between age and hearing thresholds at each frequency. A Correlation of age (years) with right- and left-ear hearing thresholds at each frequency (dB HL). B-E Correlation between age and right-ear hearing thresholds at 500 Hz (B), 1000 Hz (C), 2000 Hz (D), and 4000 Hz (E). F and G Correlation between age and left-ear hearing thresholds at 1000 Hz (F) and 8000 Hz (G). Comparisons were performed using Spearman’s rank correlation coefficient. The correlation coefficients and p-values analyzed excluding outliers are presented in parentheses. *P < 0.05; **P < 0.01

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