Table 1.

Accuracy (%) for detection of cholesterol and calcification in 1 mm and 2 mm artery sections by Raman spectroscopy

	1 mm section			2 mm section
	Cholesterol	Calcification	β Carotene	Cholesterol	Calcification	β Carotene
Sensitivity	87	81	78	87	78	92
Specificity	86	95	95	95	97	95
NPV	91	94	97	97	94	95
PPV	80	86	74	80	86	92

Cut-off values of 4% (wt/wt), 6% (wt/wt) and 4.0×10⁻³ au were used for cholesterol, calcification, and β carotene, respectively. The contribution of β carotene was used as an indirect marker for detection of cholesterol (in bold).

NPV, negative predictive value; PPV, positive predictive value.