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Han et al1 investigated the association between blood cadmium levels (B-Cd) and depression in 395 people, aged 60 years or older. Survey was conducted three times, and positive association between B-Cd and depression was only observed in the first visit. The authors used the Korean Version of the Short Form Generic Depression Scale test (SGDS-K) for screening depression and logistic regression model was used for the analysis. I present my speculation on their statistical …
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