Table 3. Sensitivities and specificities observed for T1 and T2 and T3 and T4 at 95 and 90% confidence limits and overall sensitivities and specificities for (A) vector normalised, (B) vector normalised with first derivative and (C) vector normalised with second derivative.

Clinical stage	T1 and T2		T3 and T4		Overall
(A)
Confidence limit	95%	90%	95%	90%	95%	90%
Sensitivity (%)	94.9	92.3	87.5	84.4	91.2	88.4
Specificity (%)	91	91	94.9	97.4	93.0	94.2
(B)
Confidence limit	95%	90%	95%	90%	95%	90%
Sensitivity (%)	92.3	89.7	84.4	78.1	88.4	83.9
Specificity (%)	87.5	90.6	97.4	97.4	92.5	94.0
(C)
Confidence limit	95%	90%	95%	90%	95%	90%
Sensitivity (%)	92.3	89.7	84.4	81.3	88.4	85.5
Specificity (%)	84.4	84.4	92.3	92.3	88.4	88.4