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Table 4 Results of the two diagnostic pathways including costs* and cost-effectiveness in US$. (N = 998)

From: The role and performance of chest X-ray for the diagnosis of tuberculosis: A cost-effectiveness analysis in Nairobi, Kenya

  ZN followed by CXR (n = 998). CXR followed by ZN (n = 998)
Number of culture positive suspects 559 559
Number of patient put on treatment 666 551
Number Culture pos. patient put on treatment 514 496
C+/ZN+ patients put on treatment 335 308
C+/ZN- patient put on treatment 179 188
Number Culture neg. patients put on treatment (Over diagnosis) 152 56
Number Culture pos. patients not put on treatment (Under diagnosis) 45 63
Laboratory service   
Labour costs $973 $973
Investment costs $135 $135
Running costs $1,706 $1,151
Total laboratory costs $2,814 $2,259
X-ray service   
Labour costs 154 $154
Investment costs 237 $237
Running costs 1,278 $1,946
Total CXR service costs 1,669 $2,337
Total diagnostic costs $4,483 $4,596
Cost per correctly diagnosed patient $8.72 $9.27
Total treatment costs ** $76,565 $63,422
Diagnostic costs + treatment costs $81,048 $68,018
Cost per correct diagnosed patient including costs of treatment. $158 $137
  1. * costs only include health service costs
  2. ** costs for health service to treat a patient: $115