Table 4.

Results of brush biopsy and scalpel biopsy

N = 79	Scalpel Biopsy Malignant or Dysplastic	Scalpel Biopsy Benign	Total
Brush Biopsy Positive	1	0	1
Brush Biopsy Atypical	25	5	30
Brush Biopsy Negative	1	47	48
Total	27	52	79

Sensitivity of brush biopsy: 96.3%; 95% CI, 87%-100%).

Specificity of "positive" brush biopsy result: 100%; 95% CI, 93%-100%

Specificity for "atypical" brush biopsy result: 90.4%; 95% CI, 82%-97%

Positive predictive value of an abnormal brush biopsy: 84%

Negative predictive value of an abnormal brush biopsy value: 98%.