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The phthisis death-rate since 1850 (corrected for differences in the age constitution of the
population) in relation to the mean death-rate of the period 1851-1909 (males and females) is shown
in diagram XXI.
This diagram shows the marked decline of phthisis mortality in both sexes, the greater incidence
of such mortality on males than on females, and the fact that until the last seven years the decline has
been more manifest in females than in males. This alteration in the relative decline in the deathrate
of the two sexes in recent years may, however, be an apparent alteration only inasmuch as it would
be explicable if there has been change in the relative proportions of the two sexes in the population
since the last census.
The following table shows the crude phthisis death-rate, and the rate corrected for differences
in the age and sex constitution of the population of the various sanitary districts. The factors for
correction, also shown in the table, have been calculated by applying the population at each age and
for each sex of each of the London sanitary districts to the death-rates at each age and for each
sex obtaining for London in the five years 1897-1901:—

1 See footnote (2) page 6
2 The standard death-rate used in the calculation of the "factors for correction "has been calculated to more
than the two places of decimals shown in the table.