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Table 1 Comparison of selenium content in the blood and nails between high- and low-selenium areas

From: Effect of dietary selenium intake on gut microbiota in older population in Enshi region

Environment type Region Cases Blood selenium concentration (µg/mL) Nail selenium concentration (µg/g)
High-selenium area 1 13 0.129 ± 0.900 0.837 ± 0.573
2 20
3 17
Low-selenium area 1 24 0.057 ± 0.165 0.362 ± 0.199
2 26