RT Journal Article T1 Standardized Map of Iodine Status in Europe. A1 Ittermann, Till A1 Albrecht, Diana A1 Arohonka, Petra A1 Bilek, Radovan A1 de Castro, Joao J A1 Dahl, Lisbeth A1 Filipsson Nystrom, Helena A1 Gaberscek, Simona A1 Garcia-Fuentes, Eduardo A1 Gheorghiu, Monica L A1 Hubalewska-Dydejczyk, Alicja A1 Hunziker, Sandra A1 Jukic, Tomislav A1 Karanfilski, Borislav A1 Koskinen, Seppo A1 Kusic, Zvonko A1 Majstorov, Venjamin A1 Makris, Konstantinos C A1 Markou, Kostas B A1 Meisinger, Christa A1 Milevska Kostova, Neda A1 Mullen, Karen R A1 Nagy, Endre V A1 Pirags, Valdis A1 Rojo-Martinez, Gemma A1 Samardzic, Mira A1 Saranac, Ljiljana A1 Strele, Ieva A1 Thamm, Michael A1 Top, Işık A1 Trofimiuk-Müldner, Malgorzata A1 Ünal, Belgin A1 Koskinen, Seppo A1 Vila, Lluis A1 Vitti, Paolo A1 Winter, Benjamin A1 Woodside, Jayne V A1 Zaletel, Katja A1 Zamrazil, Vaclav A1 Zimmermann, Michael A1 Erlund, Iris A1 Völzke, Henry K1 epidemiology K1 iodine K1 iodine supply K1 method comparison AB Background: Knowledge about the population's iodine status is important, because it allows adjustment of iodine supply and prevention of iodine deficiency. The validity and comparability of iodine-related population studies can be improved by standardization, which was one of the goals of the EUthyroid project. The aim of this study was to establish the first standardized map of iodine status in Europe by using standardized urinary iodine concentration (UIC) data. Materials and Methods: We established a gold-standard laboratory in Helsinki measuring UIC by inductively coupled plasma mass spectrometry. A total of 40 studies from 23 European countries provided 75 urine samples covering the whole range of concentrations. Conversion formulas for UIC derived from the gold-standard values were established by linear regression models and were used to postharmonize the studies by standardizing the UIC data of the individual studies. Results: In comparison with the EUthyroid gold-standard, mean UIC measurements were higher in 11 laboratories and lower in 10 laboratories. The mean differences ranged from -36.6% to 49.5%. Of the 40 postharmonized studies providing data for the standardization, 16 were conducted in schoolchildren, 13 in adults, and 11 in pregnant women. Median standardized UIC was YR 2020 FD 2020-07-15 LK http://hdl.handle.net/10668/15645 UL http://hdl.handle.net/10668/15645 LA en DS RISalud RD Apr 5, 2025