Table 3.

Multivariate model of Sensitivity for the Detection of HBsAg, HCV and HIV*. For each variable, the reference category is indicated in the footnotes; a negative parameter indicates worse sensitivity and a positive one better sensitivity. Variables included in each model differed; those not shown were not significantly associated with sensitivity.

HBsAg
Variable	Parameter	95% CI	p value
Test categorya
Rapid test	-0.52	(-0.73, -0.30)	<0.0001
Countryb
Country #8	-0.20	(-0.34, -0.05)	0.0077
Infrastructurec
Produces components including Platelets	-0.10	(-0.25, 0.05)	0.1821
% Voluntary Donorsd
76%-99%	0.03	(-0.08, 0.14)	0.5687
100%	0.11	(0.09, 0.20)	0.0335
HCV
Test categorya
Ag/Ab Combo test	-0.19	(-0.38, 0.01)	0.0619
Rapid test	-0.30	(-0.50, -0.09)	0.0047
Countryb
Country #8	-0.33	(-0.49, -0.16)	0.0001
Qualification of Directore
Doctoral	0.15	(0.04, 0.25)	0.0060
Staff Breakdownf
Dedicated	0.12	(0.03, 0.21)	0.0089
Number of staffg
6-10	0.08	(-0.00, 0.16)	0.0586
>10	0.05	(-0.07, 0.17)	0.4016
% Voluntary Donorsd
76%-99%	-0.09	(-0.19, 0.01)	0.0710
100%	-0.03	(-0.12, 0.07)	0.5737
HIV
Test categorya
Ag/Ab Combo test	0.06	(-0.14, 0.27)	0.5508
Rapid test	-0.09	(-0.34, 0.16)	0.4610
Countryb
Country #7	0.22	(-0.02, 0.46)	0.0727
Infrastructurec
Produces components including Platelets	0.28	(0.12, 0.44)	0.0005
Number of staffg
6-10	0.06	(-0.03, 0.15)	0.1670
>10	0.04	(-0.08, 0.15)	0.5494
% Voluntary Donorsd
76%-99%	0.03	(-0.07, 0.14)	0.5484
100%	0.05	(-0.07, 0.16)	0.4157

Reference Category

^aEIA

^bCountry #0

^cProduces RBCs only/No components

^d<75% Voluntary donors

^eNon-doctoral qualification

^fRotational

^g2-5 staff