Variations in the Urinary Iodine Concentration and Urinary Iodine/Creatinine Ratio among Preschool Children

Table 3

Descriptive and interindividual variations in the UIC and UI/Cr ratio in the population.

Time	UIC (μg/L)			UI/Cr ratio (μg/g)
	Mean	SD	CV (%)	Mean	SD	CV (%)
8:00 am∼10:00 am	99.83	78.49	78.62	747.73	3281.53	438.87
10:00 am∼12:00 pm	45.15	61.90	137.10	907.38	3131.45	345.10
12:00 pm∼3:00 pm	45.28	52.36	115.64	638.63	1272.53	199.26
3:00 pm∼g:00 pm	60.23	65.82	109.28	801.47	2050.04	255.78
Interindividual variations	62.62	70.22†	112.13‡	773.80	2497.92†	322.80‡
Intraindividual variations	60.59	52.34†	86.39‡	786.04	537.26†	68.35‡

UIC, urinary iodine concentration, UI/Cr ratio, urinary iodine/creatinine ratio, CVs, coefficients of variance. Intraindividual and interindividual variations at each time point. Intraindividual and interindividual variations of each subject within one day. †Calculations using the mean variance among individuals and using ANOVA techniques provided similar results. ‡Calculated as .