Comparison of ANN and LR in Training Set, % (N = 927).

a<p>Mean±SE,</p>b<p>comparison with same variables set,</p>c<p>comparison with ANN model,</p>d<p>comparison with LR model.</p><p>Group 1: all variables.</p><p>Group 2: high odds ratio variables (Foley, nasogastric tube and steroids).</p><p>Group 3: medical devices as variables (Foley, CVC catheter, arterial line and nasogastric tube).</p><p>Group 4: low odds ratio variables (CVC catheter, arterial line and stress ulcer prophylaxes).</p><p>Group 5: underlying condition and medications as variables (hemodialysis, stress ulcer prophylaxes and steroids).</p><p>Abbreviations: ANN = artificial neural network, LR = logistic regression, Sens. = sensitivity, Spec. = specificity, PPV = positive predictive value, NPV = negative predictive value, AUC = area under the receiver operating characteristic curve.