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Heterogeneity between studies was evaluated for each analysis using Cochrans Q statistic (measure of weighted square deviations), with N-1 degrees of freedom (where N is the number of studies), between studies variance (T2), and ratio of the true heterogeneity to total observed variation ( I 2 )
To estimate excess deaths (that is, deaths that could have been prevented had the low- and middle-education groups experienced the same mortality decline as the high-education group ( m t )), we projected counterfactual death rates using the high-education groups \(\overline{\mathrm{AARR \) applied to each groups own baseline rates: where \({\bar{m _{\mathrm{base \) is the mean of the 1992 and 1993 age-standardized death rates for the low- or middle-education group
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