Table 2. Performance of the PURE-LAMP test for TB detection in TB suspects based on spot sputum.
| Site and no. of test | Sensitivity | Specificity (no tuberculosis) | PPV | NPV | ||
| All culture positive | Smear positive and culture positive | Smear negative and culture positive | ||||
| Xinxiang | ||||||
| Correct–no./total no. (%) | 205/303(67.66) | 104/117(88.89) | 101/186(54.30) | 587/599(98.00) | 205/217(94.47) | 587/685(85.69) |
| Huojia | ||||||
| Correct–no./total no. (%) | 60/72 (83.33) | 48/48(100) | 12/24 (50.00) | 351/355(98.87) | 60/64(93.75) | 351/363(96.70) |
| All patients | ||||||
| Correct–no./total no. (%) | 265/375(70.67) | 152/165(92.12) | 113/210(53.81) | 938/954(98.32) | 265/281(94.31) | 938/1048(89.50) |