TABLE 2.

OD values of samples used to establish the cutoff

Samples	No.	OD
		Range	Mean	SD
Random blood donorsa	84	0.081-0.235	0.106	0.026
Autoimmune diseasea	20	0.094-0.176	0.111	0.024
Rheumatoid factora	20	0.089-0.358	0.121	0.058
Hepatitis Ab	17	0.089-0.178	0.112	0.025
Hepatitis Bb	3	0.088-0.121	0.103	0.025
Hepatitis Cb	5	0.083-0.109	0.093	0.007
Total	149	0.081-0.358	0.109	0.032

^aHuman sera.

^bChimpanzee sera.