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Modifications of BME Analysis 189
Figure 9.8. Soft (interval) death-rate data for County 2 and County 12 (in
number of deaths per 100,000 cases per day). The error bars represent
the uncertainty in the data.
raise some interesting issues, particularly with respect to confounding factors
such as socio-economic condition, pollution, etc. Also, the list of possible risk
factors may include age, gender, preexisting health conditions, etc. Neverthe-
less, on the basis of the information available, no considerable confounding
was identified (no confounding variables were found to be closely associated
