Table 1 The sample size, median, and range of urinary iodine concentration of subjects in year 2011 and 2013 stratified by age
2011 | 2013 | Z | p | |||
|---|---|---|---|---|---|---|
Age | N | Median (range) (μg/L) | N | Median (range) (μg/L) | ||
8-year-old | 102 | 245.3 (780.1) | 489 | 173.0 (731.2) | −5.035 | 0.000 |
9-year-old | 150 | 233.0 (761.2) | 525 | 181.5 (936.3) | −4.990 | 0.000 |
10-year-old | 139 | 243.7 (842.0) | 542 | 165.5 (983.6) | −5.715 | 0.000 |
Total | 391 | 237.1 (862.3) | 1556 | 174.3 (586.0) | −9.119 | 0.000 |