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Table 2 Compilation of Japanese urine iodine studies

From: Assessment of Japanese iodine intake based on seaweed consumption in Japan: A literature-based analysis

Author(s) [source] Year Number of participants Age Sex Mean Urine Iodine ( μg/L, μg/g Cr, or μg/24-hour) Median Urine Iodine ( μg/L) City/Region
Suzuki et al. [50] 1965 2    1565 μg/24-hour (hospital diet)   Hokkaido
Suzuki et al. [50] 1965 5    23300 μg/24-hour (seaweed diet)   Hokkaido
Suzuki et al. [50] 1965 7    175 μg/24-hour (iodine restricted)   Hokkaido
Nagataki et al. [39] 1967 9   Both 3286 μg/24-hour   Tokyo
Suzuki et al. [64] 1985 5 19-26 Male 357 μg/24-hour   
Suzuki et al. [64] 1985 10 19-21 Male 149 μg/24-hour   
Yabu et al. [65] 1986 127 18-57 Both 3238 μg/L   
Yabu et al. [66] 1988 127 18-57 Both 3022 μg/g Cr   
Yabu et al. [66] 1988 43 4-10 Both 2756 μg/g Cr   
Yabu et al. [66] 1988 30 Infant Both 1854 μg/g Cr   
Yabu et al. [66] 1988 24 11-32 Female 1701 μg/g Cr   
Yabu et al. [66] 1988 73 18-27 Female 2845 μg/g Cr   
Nagataki [67] 1993 14    660 μg/g Cr   Tohoku
Nagataki [67] 1993 13    1090 μg/g Cr (hospital diet)   Tohoku
Nagataki [67] 1993 13    1760 μg/g Cr (hospital diet)   Tokyo
Nagataki [67] 1993 22    1460 μg/g Cr (hospital diet)   Shinsyu
Nagataki [67] 1993 8    1370 μg/g Cr (hospital diet)   Kyoto
Nagataki [67] 1993 19    910 μg/g Cr (hospital diet)   Nagasaki
Konno et al. [49] 1994 4138 Mean ~45 Both 3300 μg/L   Sapporo
Tsuda et al. [68] 1995 84     596 μg/L Nagasaki
Nagata et al. [47] 1998 150 Mean ~52 Both 1480 μg/L   Nishihara
Nagata et al. [47] 1998 37    1470 μg/24-hour   Nishihara
Nagata et al. [47] 1998 20 Mean ~51 Both 1620 μg/L   Yamagata
Nagata et al. [47] 1998 54 Mean ~49 Both 1200 μg/L   Kobe
Nagata et al. [47] 1998 80 Mean ~50 Both 810 μg/L   Hotaka
Ishigaki et al. [69] 2001 250 7-14 Both   362 μg/L Nagasaki
Ishigaki et al. [69] 2001 50 Adult Both   208 μg/L Hamamatsu
Ishigaki et al. [69] 2001 50 Adult Both   1015 μg/L South Kayabe
Takamura et al. [70] 2003 4 18-24 Male 406 μg/L   Nagasaki
Zimmermann et al. [71] 2005 302 6-12 Both 296 μg/L 292 μg/L Central Hokkaido
Zimmermann et al. [71] 2005 280 6-12 Both 728 μg/L 741 μg/L Costal Hokkaido
Tomoda et al. [72] 2005 47 Mean ~53 Both 428 μg/g Cr   
Tomoda et al. [72] 2005 21 Mean ~56 Both 587 μg/g Cr   
Fuse et al. [73] 2007 654 6-12 Both   281 μg/L Tokyo
Miyai et al. [74] 2008 6 Mean ~27 Both 560 μg/24-hour   
Miyai et al. [74] 2008 14 Mean ~27 Both 1110 μg/24-hour   
Orito et al. [75] 2009 514 Adult Female (pregnant)   328 μg/L Kobe