Table 3.

Sensitivity, specificity, false-positive (FP) value, false-negative (FN) value and area under the receiver operating characteristic curve (AUC) for evaluation of three-dimensional near-infrared reflection scans at 850 nm from the occlusal viewpoint (NIRR occlusal) and from trilateral evaluation (NIRR trilateral) and of digital bitewing radiography (BWR) using micro-computed tomography as a reference standard (lower and upper 0.95 confidence interval (CI) in parentheses)

		Sensitivity	Specificity	FP	FN	AUC
NIRR occlusal	All samples	0.33 (0.23–0.42)	0.84 (0.78–0.89)	0.16 (0.11–0.22)	0.67 (0.57–0.74)	0.58 (0.51–0.66)
	Premolars	0.42 (0.26–0.58)	0.89 (0.76–1.03)	0.11 (− 0.03–0.24)	0.58 (0.42–0.73)	0.66 (0.51–0.80)
	Molars	0.26 (0.14–0.38)	0.83 (0.76–0.89)	0.17 (0.11–0.24)	0.74 (0.62–0.81)	0.54 (0.45–0.64)
NIRR trilateral	All samples	0.47 (0.37–0.57)	0.75 (0.69–0.82)	0.25 (0.18–0.31)	0.53 (0.43–0.61)	0.61 (0.54–0.68)
	Premolars	0.50 (0.34–0.66)	0.79 (0.61–0.97)	0.21 (0.03–0.39)	0.50 (0.34–0.67)	0.65 (0.50–0.79)
	Molars	0.44 (0.31–0.58)	0.75 (0.68–0.82)	0.25 (0.18–0.32)	0.56 (0.42–0.64)	0.60 (0.51–0.69)
BWR	All samples	0.27 (0.17–0.36)	1.00 (1.00–1.00)	0.00 (0.00–0.00)	0.73 (0.64–0.80)	0.63 (0.55–0.70)
	Premolars	0.33 (0.18–0.49)	1.00 (1.00–1.00)	0.00 (0.00–0.00)	0.67 (0.51–0.81)	0.65 (0.50–0.80)
	Molars	0.22 (0.11–0.33)	1.00 (1.00–.100)	0.00 (0.00–0.00)	0.78 (0.67–0.84)	0.60 (0.50–0.69)