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Fig. 3 | BMC Geriatrics

Fig. 3

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

Fig. 3

Correlation between the NAM (nicotinamide) levels and hearing thresholds at each frequency. A Correlation of NAM levels (μM) with right- or left-ear hearing thresholds at each frequency (dB HL). B and C Correlation between NAM levels and left-ear hearing thresholds at 250 Hz (B) and 2000 Hz (C). 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

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