Table 3. Stratified analysis of Mtb detection and cost-effectiveness.

Category	Order of tests	Mtb detection				Costs (US $)
		Specimens examined	Cases detected	Incremental cases		Average cost for per case	Cost for per incremental case
Pulmonary tuberculosis
Smear-positive	1st	464	422	–		14.51	–
	2nd	464	430	8		28.49	765.60
Smear-negative	1st	599	193	–		40.97	–
	2nd	599	215	22		73.55	359.40
Total	1st	1,063	615	–		22.82	–
	2nd	1,063	645	30		43.51	467.72
Extrapulmonary tuberculosis
Smear-positive	1st	97	59	–		21.70	–
	2nd	97	60	1		42.68	1,280.40
Smear-negative	1st	301	91	–		43.66	–
	2nd	301	108	17		73.58	233.72
Total	1st	398	150	–		35.02	–
	2nd	398	168	18		62.54	291.87