a trend toward significanceP = 0.0658
In predicting need for ICU admission, there was a trend toward significance between PSI and APACHE-II (Z statistic = 1.840, P = 0.0658), and there was no significance between PSI and CURB-65 (Z statistic = 1.355, P = 0.175), and between CURB-65 and APACHE-II (Z statistic = 0.0622, P = 0.9504).