Box plots of arsenic concentrations in groundwater and hair ofresidents living in rural areas. a) Kandal province and borderingprovinces in Cambodia. b) Upper Vietnamese Mekong delta. c) RedRiver delta, Vietnam. Average values are indicated by solid lines (—),medians by dashed lines (- - -). The columns contain 50% of the data,the vertical lines 95%. Open circles are data points outside the 95%range. Thep-values are derived from a pairedt-test
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