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Using unpublished data from an original study by Turner et al. (2010a), the relationship between first morning void (FMV) and 24-hour urine collections was examined in UK adults to determine if FMV collections provide a reasonable estimate of DON intake compared to 24-hour collections. The intraclass correlation coefficient (ICC) was computed to evaluate variability in DON concentrations and generalized estimating equation (GEE) models were used to assess the relationship between collection types. Greater between-person variability was observed in 24-hour collections, unadjusted and adjusted for creatinine (ICC=0.78 and 0.56, respectively). GEE models suggest urinary DON concentrations in FMV collections were strongly correlated with 24-hour collections (r=0.78, p