Reliability or difference between “inter-subject” (n = 7) and “pool” studies at each site (marshland, marina, fishing harbour and seaport) at D21 for the 14 heavy metals called biomarkers of effect.

Green shading represents 0–20% difference, red shading represents 20–30% difference and yellow shading represents more 30% difference. Negative percentages are lower rates in the “inter-subject” study compared to the “pool” analysis.