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

SCC AND EFFICIENCY VARIABLES IN DISTRICT TB PROGRAMME 13
Table 3. Sputum conversion among cases diagnosed in DTP on various mixes of SR & SCC regimens
(taking the rate of compliance as in Table 1)
Situation
of regimen mix
Proportion of Cases
on(%)
Sputum Negative
(Number)*
Efficiency
(%)
SR On SR On SCC Total Trt Eff DTP Eff
(a) (b)
SCC
I 100 0 328 0 328 49.71 16.40
II 90 10 295 52 347 52.63 17.37
III 80 20 263 104 367 55.54 18.33
IV 70 30 230 156 386 58.46 19.29
V 60 40 197 208 405 61.37 20.25
VI 50 50 164 260 424 64.28 21.21
VII 40 60 132 312 444 67.20 22.18
VIII 30 70 98 365 463 70.11 23.14
IX 20 80 66 416 482 73.03 24.10
X 10 90 33 468 501 75.94 25.06
XI 0 100 0 520 520 78.86 26.02
Case-finding potential - 2,000 : Case-finding efficiency (33% of 2,000) - 660; (a) Trt, eff= (Treatment
efficiency) = ((value in column 6)/660) x 100; (b) DTP. Eff-(DTP efficiency) - ((value in column 6)/2,000) x 100;
* For values of cases, decimal points omitted, being number of cases
of conversions achieved at varying compliance
structures, either under SR, SCC, or the various
mixes of SR and SCC (Tables 1,2 and column 7 of
Table 3).
DTP efficiency : (H in Fig.) It is the proportion of
cases estimated to be sputum negative out of the
total diagnosable cases m the DTP i.e., casefinding
potential of 2,000. The sputum
conversions are computed as under treatment
efficiency. It needs to be underlined that the
denominator includes the number of smear
positive cases who report themselves for
diagnosis to the participating centres of the DTP
but are not diagnosed. As a manifestation of
shortfall in the efficiency of DTP, a proportion of
cases are thus denied treatment and possible
conversion which should have occurred if all the
cases had been diagnosed.
The formula used in estimating DTP efficiency
is H-D X G(G- E x proportion of SR in the
mix) + (F X proportion of SCC in the mix).
Results
Mix of Regimens
Table 3 computes the various mixes of the
proportion of cases likely to be on SR and SGC in
the DTPs where SCC is implemented, as
situations I to XL At one extreme could be placed
the DTPs where SCC is not implemented at all
(situation I with 100% SR and 0% SCC) and on
the other the presently hypothetical and
unrealistic situation where all the diagnosed
sputum positive cases are on SCC (situation XI).
In between the two extremes, one may expect
DTPs where SCC is implemented to the extent of
10% to 90% of cases on SCC with corresponding
decrease in the proportion of cases on SR.
Expectations of sputum conversions, as a
proportion of the estimated number of diagnosed
cases relative to the various mixes detailed as
above, are also given in the Table.
Treatment efficiency under mixes
The treatment efficiency in a district with no