The Indian Journal of Tuberculosis - LRS Institute of Tuberculosis ...

174
SUMMARIES OF PAPERS
rate (CDR) of 70% of new smear-positive cases.
COR is the number of reported cases per 100,000
persons annually divided by incidence per 100,000
per year. The incidence is uncertain, not measured
but estimated. An alternative indicator is patient
diagnostic rate (PDR), which is measured as number
of reported cases per 100,000 persons annually
divided by prevalence per 100,000 per year.
Objective: To estimate the PDR and compare it with
CDR.
Methodology: TB Research Centre has generated
data on prevalence and incidence among the adult
population aged 15 years and above from community
surveys in a rural area of 580,000 population in
Tiruvallur district, Tamil Nadu after implementation
of RNTCP. TB Patients attending the health facilities
were registered under RNTCP. The prevalence and
incidence of TB and the number of cases reported
per 100,000 per year (notification rate) were used
to estimate PDR and CDR. The estimation of PDR
is restricted to the .new cases.
Results: The prevalence and incidence of new smearpositive
cases were 153 and 127 respectively per
100,000 as estimated from the survey conducted
during 2001-2003. During 2003, 446 new smearpositive
cases were detected and treated. Assuming
70% of the general population aged >15 years, the
notification rate was 11 0 11 00,000. The PDR was
72% against the CDR of 87% in 2003.
Conclusion: Monitoring the TB control programme
measured by PDR through prevalence survey is
reliable compared to CDR estimated from incidence.
Indian Journal of Tuberculosis