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Variation of OHPAHs (μg L−1) both for cases and controls (+ outliers, o values above 3rd quartile and * p-value < 0.05) in logarithmic scale (1OHPYR:1-hydroxypyrene, 1OHPHE:1-hydroxyphenanthrene, 1OHNAP:1-naphthol, 9OHPHE:9-hydroxyphenanthrene, 2OHPHE:2-hydroxyphenanthrene, 2OHNAP:2-naphthol, 3OHPHE:3–hydroxyl-phenanthrene).
