Table 5 : Forward selection method for Discriminant analysis model with
selected independent variables and results of serum anti-HCV antibodies
test as the dependent variables.


Selected independent variables Coefficients used in the discriminant equation

Age groups (coded as 1 for <5 yrs, 2 for 5-14 yrs,                     3 for 15-44 yrs and 4 for 45+ yrs) 0.509
History of blood transfusion 4.594
History of tattoo or cupping 3.34
(Constant) -1.349

  Discriminant score at group centroids
Negative Anti-HCV antibodies -0.014
Positive Anti-HCV antibodies 1.97
Critical value 0.978

P (model)<0.001 Discriminant score (D) = -1.349 + [0.509 x Age group (coded
as 1 for <5 yrs, 2 for 5-14 yrs, 3 for 15-44 yrs and 4 for 45+ yrs)] + [4.594 x
History of blood transfusion (coded as 1 for positive and zero for negative)] +
[3.34 x History of tattoo or cupping (coded as 1 for positive and zero for negative)]
Accuracy of prediction for negative test results=96%
Accuracy of prediction for Positive test results=42.1%
Overall Accuracy of prediction=95.6%

Khaleel et al.Epidemiology Reports  2013 1:1DOI : 10.7243/2054-9911-1-1