Assessment of non-tuberculosis abnormalities on digital chest x-rays with high CAD4TB scores from a tuberculosis prevalence survey in Zambia and South Africa

Table 2 Inter-reader agreement between Reader 1 and Reader 2

Level of agreement	Observed Agreement %	Expected Agreement %	Kappa
Overall reading
Non-TB abnormalities	62.86	54.59	0.18
*Anatomical category*
Lung parenchyma	64.00	52.54	0.24
Pleura	59.43	53.57	0.13
Mediastinum	96.57	95.15	0.30
Heart	83.43	75.37	0.33
Zambian communities only
Non-TB abnormalities	64.49	54.91	0.21
*Anatomical category*
Lung parenchyma	66.67	52.54	0.30
Pleura	56.52	52.28	0.09
Mediastinum	97.10	95.74	0.32
Heart	84.78	74.64	0.40
South African communities only
Non-TB abnormalities	61.04	54.18	0.15
*Anatomical category*
Lung parenchyma	61.04	52.51	0.18
Pleura	62.65	55.13	0.17
Mediastinum	81.93	76.09	0.27
Heart	95.98	94.51	0.24

ISSN: 1471-2334