Table 3 The sample size, median, and range of urinary iodine concentration of subjects in year 2011 and 2013 stratified by urban areas and rural areas
2011 | 2013 | Z | p | |||
|---|---|---|---|---|---|---|
Area | N | Median (range) (μg/L) | N | Median (range) (μg/L) | ||
Urban areas | 282 | 254.8 (862.3) | 967 | 169.0 (986.0) | −9.640 | 0.000 |
Rural areas | 109 | 204.7 (545.0) | 589 | 186.1 (596.2) | −1.719 | 0.086 |
Total | 391 | 237.1 (862.3) | 1556 | 174.3 (586.0) | −9.119 | 0.000 |