Table 5.

Statistical analysis

Technique	Sensitivity	Specificity	Accuracy	PPV	NPV
Brushing	47.8% 28.10–69.66*	100% 87.30–100.00*	69.2%	100%	57.1%
Biopsy	92.1% 75.56–98.53*	100% 89.34–100.00*	93.6%	100%	75%
Balloon brushing	87.5% 52.30–99.96*	100% 64.31–100.00*	91.7%	100%	80%

* 99% C.I. (Geigy scientific tables)