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Table 2 Dried blood spot total T4 concentration (nmol/L) per calendar year (median (P5-P95) for total neonatal population and TSH subpopulation (Kruskall-Wallis)

From: Neonatal heel prick screening TSH concentration in the Netherlands as indicator of iodine status

  Total T4 (nmol/L) p-value
2007 2008 2009 2010 2011 2012 2013 2014 2015
Total population 87 (58-126) 83 (57-118) 85 (58-120) 90 (63-127) 88 (61-125) 87 (60-123) 86 (60-122) 86 (59-122) 91 (62-128) χ2 = 40, 8 d.f., p < 0.0001
TSH-subpopulation 64 (48-77) 62 (46-74) 64 (47-77) 68 (52-79) 66 (50-78) 65 (49-77) 65 (49-77) 65 (48-76) 68 (51-80) χ2 = 150, 8 d.f., p < 0.0001