|ARE THE ABSENTEES FOR EXAMINATIONS IN THE EPIDEMIOLOGICAL
SURVEY OF TUBERCULOSIS DIFFERENT FROM THOSE EXAMINED?
|VV Krishna Murthy & KT Ganapathy: NTI Newsletter
1989, 25, 15-21.
It is a common observation that in epidemiological
surveys all those eligible for various examinations (tuberculin,
X-ray and sputum examinations) do not attend them. If the 'non-attenders'
differ from the 'attenders' the true situation of the problem may
not be known. In this paper, the prevalence of infection, bacillary
cases and suspect cases at II survey for both attenders and non-attenders
of the I survey from longitudinal study conducted by National Tuberculosis
Institute, Bangalore, are compared.
It was observed that in spite of repeated attempts,
nearly 1/5th of the population did not attend examinations. The
non- response group during I survey was examined at the subsequent
survey and both response and non- response groups at the preceding
survey were compared. It was found that in respect of prevalence
of infection and bacillary disease, the two groups did not differ,
but the mortality and emigration was higher among the non- response
group. Higher mortality among non-attenders may be due to the fact
that the group contained more sick people. The higher emigration
among non-attenders due to small error even to the extent of 0.5%
at the stage of census taking by registering a non-resident as permanent
resident of the village would highly boost the rate of emigration
among non- attenders. The difference in the indices of crude mortality
and emigration rates becomes narrower and narrower as coverages
for examinations increase. The analysis indicates that every attempt
should be made to obtain as high a coverage as possible in order
to obtain valid estimates of epidemiological indices in a population
|KEY WORDS: SURVEY, ABSENTEES, CRUDE MORTALITY,