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By Joene Hendry
NEW YORK (Reuters Health) - Elderly men and women who sip on several cups of green tea a day may be less likely to have the blues, hint findings of a study from Japan.
Dr Kaijun Niu, at Tohoku University Graduate School of Biomedical Engineering in Sendai, and colleagues found men and women aged 70 and older who drank four or more, versus one or fewer, cups of green tea daily were 44 percent less likely to have symptoms of depression.
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Epidemiological studies describing population characteristics which collect data at one point in time and then consider relationships between observed characteristics.. Because they don't look at time trends they cannot establish causes.