From: Comparison of different commercial ELISAs for detection of antibodies against porcine respiratory and reproductive syndrome virus in serum
S/P value
Mean
S.D.
Minimum
Maximum
Group 2
Positive
1.46
0.66
0.42
3.01
Negative
0.13
0.00
0.37
Group 3
0.01
0.02
0.20
Group 4
0.06
0.07
0.39
Group 5
0.31
Positive n = 2
-
0.64
2.22