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Table 1 Exposure parameters used for the health risk estimations via consumption of clay [27] (US EPA)

From: Potential health risk assessment of toxic metals contamination in clay eaten as pica (geophagia) among pregnant women of Ho in the Volta Region of Ghana

ParameterUnitChildAdult
Body Weight (BW)Kg1575
ExposureDays/ years365365
Frequency (EF)
 ExposureYears630
Duration
 Ingestion Rate (IRclay)mg/day200100
 Average Time (AT)Days/years  
 For carcinogenic 365 × 70366 × 70
 For non-carcinogenic 365x ED365x ED