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14
insured people in the Borough, the lowest number was 67 per cent.
in August and the highest 10 5 in January.

Crude Death Rate per 1.000 of the estimated resident population—113.
Death Rate Comparability Factor (C.F.) = 0.94.
Adjusted Death Rate =
Crude Death Rate X C.F. = 113 X 0.4 = 10.6.
Since the population of all areas are not similarly constituted as
regards the proportions of their sex and age group components, their
Crude Death Rates (deaths per 1,000 population) cannot be accepted
as valid comparative measures of the mortalities experienced by the
several populations, and fail as true comparative mortality indexes in
that their variations are not due to mortality alone, but arise also from
differences in their population constitution, the two elements being
combined in indistinguishable proportions.
The Registrar General has prepared Comparability Factors for
adjusting local death rates, and when the Crude Death Rate of an
Area is multiplied by the appropriate Factor, an "Adjusted Death
Rate" is obtained which is comparable with the Crude Death Rate of
the country as a whole, or with the "Adjusted Death Rale" of any
other area.