Fig. 4From: Correlations of water iodine concentration to earlier goitre frequency in Sweden—an iodine sufficient country with long-term iodination of table saltCorrelation between median urinary iodine concentration (UIC) from children in each of 30 schools (Fig. 2) and median water iodine concentration (WIC) from (a) water treatment plants in the same Swedish municipalities (p = 0.006) and (b) the tap water in the same schools (NS)Back to article page