Table 2:

Performance accuracy of PTeye® in label-free intraoperative parathyroid gland identification in the blinded multi-centric study.

	Number of parathyroid glands tested	Number of non-parathyroid sites* tested	Sensitivity	Specificity	Positive Predictive Value	Negative Predictive Value	False Negative Rate	False Positive Rate	Accuracy	kappa (k)
Site 1	90	405	90.0%	87.2%	60.9%	97.5%	10.0%	12.8%	87.7%	0.65
Site 2	85	404	96.5%	93.8%	77.4%	99.2%	3.5%	6.2%	94.3%	0.82
Site 3	211	553	97.6%	93.9%	86.5%	99.0%	2.4%	6.1%	94.9%	0.88
Overall	386	1362	95.6%	91.9%	76.9%	98.7%	4.4%	8.1%	92.7%	0.8

^*- Non-parathyroid sites included thyroid glands, fat, muscle, trachea, thymic tissue, lymph nodes and fibro-adipose tissues.