TABLE 2.
Detection with five primer pairs of H. pylori in 100 gastric biopsy samples by two investigators (A and B)
| Parametera | Primer pair and investigator
|
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Hp1/HP2
|
HP64-f/HP64-r
|
VAG-F/VAG-R
|
EHC-U/EHC-L
|
ICT37/ICT38
|
||||||
| A | B | A | B | A | B | A | B | A | B | |
| True positive (n) | 47 | 45 | 47 | 46 | 48 | 33 | 42 | 40 | 45 | 44 |
| False negative (n) | 3 | 5 | 3 | 4 | 2 | 17 | 8 | 10 | 5 | 6 |
| False positive (n) | 3 | 1 | 4 | 1 | 1 | 0 | 2 | 1 | 2 | 1 |
| True negative (n) | 47 | 49 | 46 | 49 | 49 | 50 | 48 | 49 | 48 | 49 |
| Sensitivity (%) | 94 | 90 | 94 | 92 | 96 | 66 | 84 | 80 | 90 | 88 |
| Specificity (%) | 94 | 98 | 92 | 98 | 98 | 100 | 96 | 98 | 96 | 98 |
| Accuracy (%) | 94 | 94 | 93 | 95 | 97 | 83 | 90 | 89 | 93 | 93 |
| PPV (%) | 94 | 98 | 92 | 98 | 98 | 100 | 95 | 98 | 96 | 98 |
| NPV (%) | 94 | 91 | 94 | 92 | 96 | 75 | 86 | 83 | 91 | 89 |
a
n, Number of samples; PPV, positive predicative value; NPV, negative predicative value.