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Distribution of PROP taster groups by age in the isolated community of Val Borbera, Northwest Italy. n = 589; sample size per age group: 59 (15–30 years); 191 (31–50 years); 261 (51–70 years); 78 (71+ years). The percentage of non-tasters increased and the percentage of super-tasters decreased in those >50 years of age (by Chi-square analysis; p < 0.001). Unpublished data from Tepper et al. [107].
