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Relationship between age and (a) blood ammonia concentration (y = 0.721x + 39.95, R 2 = 0.367, and p < 0.001); (b) blood CAR concentration (y = 0.585x + 32.65, R 2 = 0.327, and p < 0.001) and (c) blood ALCAR concentration (y = −0.118x + 16.31, R 2 = 0.411, and p < 0.001).
