Original Articles
Copyright ©The Author(s) 1999.
World J Gastroenterol. Apr 15, 1999; 5(2): 132-134
Published online Apr 15, 1999. doi: 10.3748/wjg.v5.i2.132
Table 2 Formulae for evaluation of DIGFA
IndexFormulaeIndexFormulae
Sensitivitya/(a+c)Specificityd/(b+d)
Positive predictive valuea/(a+b)Negative predictive valued/(c+d)
Accuracy(a+d)/NYouden index[a/(a+c)]/[d/(b+d-1)]
Positive likelihood ratio[a/(a+c)]/[b/(b+d)]Negative Likelihood ratio[c/(a+c)]/[d/(b+d)]