Assessing Repeated Urinary Proline Betaine Measures as a Biomarker of Usual Citrus Intake during Pregnancy: Sources of Within-Person Variation and Correlation with Reported Intake.

Nevertheless, in the current analyses, season explained only a small proportion (3%) of the variation in urinary Pro-B, and its relationship with elevated Pro-B in logistic regression analyses did not reach statistical significance for non-normalized data ( Table 5 ).

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