CXR on all suspects (n = 998) | ||||
---|---|---|---|---|
Score of the reader | Sensitivity | Specificity | PPV | NPV |
a) Highly consistent for TB | 68 (64–72) | 90 (87–93) | 0.90 (0.87–0.93) | 0.69 (0.65–0.72) |
b) Consistent for TB | 23 (19–26) | 77 (73–80) | 0.55 (0.49–0.62) | 0.44 (0.40–0.47) |
c) Pathology, but no TB | 2 (0–3) | 96 (94–98) | 0.33 (0.16–0.51) | 0.43 (0.40–0.46) |
"TB" (a+b) | 91 (88–93) | 67 (62–71) | 0.78 (0.74–0.81) | 0.84 (0.81–.088) |
"any pathology" (a+b+c) | 92 (90–94) | 63 (58–67) | 0.76 (0.73–0.79) | 0.86 (0.82–0.90) |
CXR on suspects excluding those who were ZN positive (n = 657) | ||||
a) Highly consistent for TB | 48 (42–55) | 90 (87–93) | 0.72 (0.65–0.79) | 0.77 (0.73–0.81) |
b) Consistent for TB | 31 (25–37) | 77 (73–81) | 0.42 (0.34–0.49) | 0.68 (0.83–0.90) |
c) Pathology but no TB | 3 (1–5) | 96 (95–98) | 0.27 (0.9–0.46) | 0.65 (0.62–0.69) |
"TB" (a+b) | 80 (74–85) | 67 (62–71) | 0.56 (0.50–0.61) | 0.86 (0.83–0.90) |
The entire diagnostic process (n = 998) | ||||
ZN followed by CXR | 93 (91–95) | 62 (57–67) | 0.76 (0.72–0.79) | 0.87 (0.83–0.91) |
CXR followed by ZN | 89 (86–91) | 97(84–90) | 0.90 (0.87–0.92) | 0.86 (0.83–0.89) |