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99
Report of the Medical Officer of Health.
With a view to comparing these results the following Table
shows the case mortality in each group, calculated on the nett
cases, obtained by deducting the untrnced from the total. For
instance, for all cases male, the nett total is obtained by deducting
139 untraced from 656 total, giving 517 nett cases; 296 of
these have died, a percentage of 57.

Expressed in this way the figures show that the results are
slightly better in females than males, but the most striking fact
is the marked difference in case mortality between the sputum
positive and sputum negative cases, the deaths in the positive
cases being over three times that in the negative ones. The
group, "no record of sputum," contains many very bad cases,
generally seen only once, where no opportunity of examining the
sputum has occurred. Most of them are probably sputum positive
and the high case mortality is due to these two factors.
In both sexes there is a slightly smaller case mortality
among patients. who have received Sanatorium or Tuberculin