39: Validation of Sodium and Potassium Intake Determined from Urine Samples

Music City Center 

Some 60 of 109 study participants provided sodium (Na) and potassium (K) intakes based on 24-hour urine collection samples, and on formulae applied to data from spot urine samples. The Normal-based, percentile, bias-corrected and the bias-corrected and accelerated methods gave confidence interval (CI) estimates for within-pair differences and correlation coefficients (CCs). All bootstrap CIs and achieved significance levels (ASLs) of a test statistic indicated no statistical significance of the mean of the within-pair differences for Na intake. The ASL but not the observed and bootstrap CIs from the truncated distribution for the formula-based estimates of K was statistically different from 0. The bootstrap and observed estimates of the correlation coefficients were statistically significant for all except the correlation of Na intakes based on the PAHO/WHO formula and 24-hour collections. For all other comparisons the bootstrap samples, the observed data and the ASL yielded different conclusions. These results indicate that, to determine validity of formula-based approaches to Na and K intake estimation using urine samples from Jamaicans, there should be use of other approac

validation, bootstrap

urine samples

achieved significance levels 

Section on Statistics in Epidemiology