Table 2 Comparison between PTB and EPTB regarding laboratory diagnostic methods (AFB smear, LJ culture and Gene Xpert MTB/RIF assay)
Laboratory methods | PTB(n = 449) | EPTB(n = 133) | X2 | Pvalue |
|---|---|---|---|---|
AFB smear | ||||
Negative | 300 (66.8%) | 81 (60.9%) | 2.22 | 0.70 |
+ | 40 (8.9%) | 12 (9.0%) | ||
++ | 31 (6.9%) | 10 (7.5%) | ||
+++ | 44 (9.8%) | 18 (13.5%) | ||
++++ | 34 (7.6%) | 12 (9.0%) | ||
AFB smear | ||||
Negative | 300 (66.8%) | 81 (60.9%) | 1.59 | 0.21 |
Positive | 149 (33.2%) | 52 (39.1%) | ||
LJ culture | ||||
Positive | 122 (27.2%) | 38 (28.6%) | 0.10 | 0.75 |
Negative | 327 (72.8%) | 95 (71.4%) | ||
Gene Xpert MTB/RIF assay | ||||
Invalid | 42 (9.4%) | 11 (8.3%) | 1.55 | 0.46 |
Positive | 111 (24.7%) | 40 (30.1%) | ||
Negative | 296 (65.9%) | 82 (61.7%) | ||
Rifampicin resistance | (n = 111) | (n = 40) | ||
Yes | 14 (12.6%) | 13 (32.5%) | 7.92 | 0.005* |
No | 97 (87.4%) | 27 (67.5%) | ||