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Table 3 Study evaluation and overall confidence rating of human epidemiological studies of associations of exposures to PCBs with semen quality

From: Systematic review of associations of polychlorinated biphenyl (PCB) exposure with declining semen quality in support of the derivation of reference doses for mixture risk assessments

  1. Abbreviations: Semen quality outcomes – Conc Concentration, Mot Motility, Morph Morphology, Vit vitality, v (red shading): decline, ~ (green shading): no association, ^ (blue shading): improvement, v^ (yellow shading): direction of response dependent on congener, n.d. Not determined. Study evaluation – CD Critically deficient, P Poor, A Adequate, G Good (grey shading). Overall confidence – U Uninformative, L Low, M Medium, H High