Fig. 1From: Neonatal heel prick screening TSH concentration in the Netherlands as indicator of iodine statusDistribution of rounded nTSH values measured in heel prick blood of new-borns in the Netherlands, A in each calendar year – Kruskal-Wallis H test χ2 = 8149 P < 0.0001, B for each laboratory – Kruskal-Wallis H test χ2 = 7195 P < 0.0001, C across ages at heel prick sampling – Kruskal-Wallis test χ2 = 482 P < 0.0001Back to article page