. Author manuscript; available in PMC: 2012 Aug 13.

Published in final edited form as: Biosens Bioelectron. 2007 Dec 14;23(10):1413–1421. doi: 10.1016/j.bios.2007.11.022

Table 2.

The diagnostic values of the three tests for RA based on the detection of antibodies to the citrullinated peptide.

Test	Sensitivity	Specificity	PPV	NPV	Accuracy^Δ
Nanotube	71.9% ^*	95.8%	95.8%	71.9% ^¥	0.94
ELISA	37.5% ^*	95.8%	92.3%	53.5% ^¥	0.64
Microarray	34.4% ^*	95.8%	91.6%	52.3% ^¥	0.54

P < 0.03 for nanotube versus ELISA, and nanotube versus microarray.

^¥

P < 0.03 for nanotube versus ELISA, and nanotube versus microarray.

^Δ

Maximum accuracy of 1.0.