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Another strategy is stratification, which involves dividing the study population into subgroups based on the confounding variable and analyzing these subgroups separately

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The EPA study 9 points out that active smoking increases the risk of all four major histologic types of human lung cancer and estimates that environmental tobacco smoke is responsible for about 3000 deaths from lung cancer annually

DYC White or Apple Cider Vinegar 1 Place a shallow bowl of DYC White or Apple Cider Vinegar in the room where the smoke is the strongest

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