|MORTALITY AND CASE FATALITY OF TUBERCULOSIS CASES
DIAGNOSED IN A RURAL POPULATION OF SOUTH INDIA
|VV Krishna Murthy: NTI Newsletter 1982, 19, 8-13.
Mortality from tuberculosis is an important epidemiological
parameter for defining the problem of tuberculosis in any country.
But due to lack of systematic recording and reporting system, precise
information on cause of death is not available in our country. An
attempt has been made to estimate the case fatality of tuberculosis
cases as well as mortality of cases diagnosed in a longitudinal
study conducted from 1961-68 in Bangalore district. Crude mortality
of cases is defined as the ratio of total deaths observed among
cases to the total number of cases observed, while case fatality
is defined as the ratio of deaths that have occurred due to tuberculosis
to the total number of cases investigated.
The overall observed annual crude mortality was
14.8%, while among culture positive smear positive (C+S+) it was
21%. An upward trend was seen with the increase in the age. The
overall annual crude mortality among culture positive smear negative
(C+S-) cases was 9.5% which is significantly lower than that among
C+S+ cases. The death rates among old and new cases at the end of
18 months were 16.7% and 13.7% respectively. No statistical difference
was found in the crude mortality either among old and new cases
or in relation to the interval of diagnosis. Case fatality due to
tuberculosis was computed by calculating the deaths among non-tuberculosis
population of the same area and during same period and eliminated
from the total deaths observed among tuberculosis cases. The case
fatality of tuberculosis was found to be 13.3%. It was further observed
that out of the total 38 deaths among cases, 89% were due to tuberculosis
and 11% were due to non-tuberculosis causes.
|KEY WORDS: MORTALITY, CASE FATALITY, CASE, RURAL