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Table 1 Hair-Hg to toenail-Hg ratios determined from regression models and mean values obtained from literature

From: Chronologically matched toenail-Hg to hair-Hg ratio: temporal analysis within the Japanese community (U.S.)

Hair-Hg: Toenail-Hg n Population Citation
Based on arithmetic means Based on regression model Based on geometric means    
4.5:1a 4.2:1a   30 (hair), 29 (toenail) Non-occupationally exposed Norwegiansb [21]
   3.58:1 42 Faroese whaling men [22]
2.56:1 2.44:1c   59 Non-occupationally exposed Japanese women [15]
2.8:1 2.24:1c 2.5:1 72 Non-occupationally exposed Finns [13]
4.3:1 4.21:1c 3.5:1 39
1.4:1    161 (hair), 163 (toenail) Dentists [26]
2.4:1    161 (hair), 155 (toenail) Controls
3.08:1 2.79:1c 3.16:1d 41 (chronologically matched samples) Non-occupationally exposed Japanese women (U.S.) this study
2.77:1 2.39:1c   41 (unmatched samples)   
  1. a. Study data provided for blood-Hg and toenail-Hg values along with regression model. Hair-Hg to blood-Hg ratio of 250:1 was used to obtain hair-Hg: toenail-Hg and slope of regression model of blood-Hg on toenail-Hg [4].
  2. b. One individual had previous occupational exposure as a dental nurse.
  3. c. Ohno and co-workers [15] and Alfthan [13] provided regression models of hair-Hg on toenail-Hg with resulting slope factors. Slope in this study from linear regression model based on chronologically matched and unmatched samples are provided.
  4. d. For this study, geometric mean values for hair-Hg and toenail-Hg from matched samples were 1.410 ng/mg and 0.446 ng/mg, respectively.