Clinical and Imaging Characteristics of Smear Negative Pulmonary Tuberculosis Patients: A Comparative Study

Table 1

Patients’ classification based on concentrated smear microscopy (from AHRIL) and clinical diagnosis (from health centers), Addis Ababa, Ethiopia, 2021.

Classification of patients based on diagnoses at health centers		Classification of patients based on AHRIL’s AFB result
		SPPTB (controls)		SNPTB (cases)		Total
		Freq	%	Freq	%	Freq	%
TB diagnosis confirmed by
SPPTB	AFS	23	29.9	3	9.1	26	23.6
	GeneXpert	47	61.0	21	63.6	68	61.8
	Not indicated	7	9.1	9	27.3	16	12.6
	Total	77	70.0	33	30.0	110	100
SNPTB	Clinical and imaging findings	61	96.7	132	94.3	193	95.1
	Not indicated	2	3.2	8	5.7	10	4.9
	Total	63	31.0	140	69.0	203	100

SNPTB: smear negative pulmonary tuberculosis; SPPTB: smear positive pulmonary tuberculosis; AHRIL: Armauer Hansen Research Institute’s laboratory. Patients with negative laboratory result either by AFS, GeneXpert, or classified as SNPTB without any laboratory diagnosis at the health centers.