Chest Radiographs for Pediatric TB Diagnosis: Interrater Agreement and Utility

Table 1

Interrater agreement on abnormalities consistent with TB.

(a)

Clinician	Medical officer	Radiologist
		Normal			Abnormal likely TB			Abnormal unlikely TB			Total
		Pulmonologist
		Normal	Abnormal likely TB	Abnormal unlikely TB	Normal	Abnormal likely TB	Abnormal unlikely TB	Normal	Abnormal likely TB	Abnormal unlikely TB
Normal	Normal	345	5	30	12	0	3	18	0	4	417
	Abnormal likely TB	5	1	3	1	0	1	0	0	2	13
	Abnormal unlikely TB	83	1	20	3	1	5	10	1	6	130
Abnormal likely TB	Normal	12	1	1	0	0	1	0	0	0	15
	Abnormal likely TB	1	0	0	1	3	0	0	1	0	6
	Abnormal unlikely TB	4	1	0	1	1	1	2	0	0	10
	Normal	51	1	4	3	0	2	4	2	1	68
Abnormal unlikely TB	Abnormal likely TB	4	1	0	1	1	2	0	0	0	9
	Abnormal unlikely	10	0	2	2	1	1	4	2	1	23
Total		515	11	60	24	7	16	38	6	14	691

(b)

Outcome	Kappa (95% CI)	value
TB classification category
Abnormal	0.177 (0.124–0.237)	<0.001
Abnormal likely TB	0.193 (0.095–0.330)	<0.001
Abnormal unlikely TB	0.065 (0.026–0.125)	<0.001
Generalized/weighted kappa	0.136 (95% CI: 0.100–0.176 )	<0.001