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Fig. 3 | Nutrition Journal

Fig. 3

From: Can serum isotope levels accurately measure intestinal calcium absorption compared to gold-standard methods?

Fig. 3

Five Hour Serum Isotope Estimates Compared to 24-h Urine Fractional Calcium Absorption (FCA) Values. Five-hour serum FCA estimates correlated with 24-h urine FCA in Cohort 1 (ρ = 0.65, p = 0.002, (a) and values were not biased (b). In Cohort 2, 5-h serum estimates of FCA correlated with 24-h urine fractional calcium absorption (ρ = 0.75, p = 0.020, c). Bias is illustrated in (d); the solid line represents the mean degree of bias and dashed lines indicate the 95 % limits of agreement. Bias was not statistically significant in Cohort 2, but 5-h serum estimates explained only 35 % of the variance in Cohort 2 24-h urine FCA values

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