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It is important, however, before drawing conclusions from these figures to ascertain whether
any and, if any, how much of this seasonal variation in the case mortality of the disease may be due
to differences in the age and sex distribution of the cases notified. For this purpose I have selected
the larger figures of the period 1892.5 in preference to those of 1895, as likely to give more trustworthy
results.
The mean case mortality at each age period and for each sex in the period 1892.5 is show n in
the following table—

In order to ascertain whether the differences in the age and sex distribution of the cases notified
in each month are sufficient to materially affect the comparison of case mortalities at "all ages at
different periods of the year, I have applied the case mortalities shown in the preceding table to the
cases notified at the various age periods in each month of the period 1892.5. The result of this
operation is shown in the columns headed "estimated deaths " in the following table