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Table 3 Analysis of the distribution of negative results by five HIV Combo assays. Signal-to-cutoff (S/CO) ratios, standard deviation (SD) and SD ratio from the mean S/CO to the cut-off by the five HIV 4th generation screening assays employed

From: Serological diagnosis and prevalence of HIV-1 infection in Russian metropolitan areas

Test system

Number of specimens

Mean S/CO value

Standard deviation (SD)

SD to cut-off ratio

Abbott

5217

0.11

0.048

18.443

Bio-Rad

5210

0.32

0.118

5.777

Vector-Best

5203

0.13

0.139

6.310

DS

5213

0.09

0.1

9.134

MBU

5220

0.12

0.136

6.493