Sample Size From the previous studies, it is known that ROC of GCS in children for prediction of mortality is 0.7.15 Assuming FOUR score to be better predictor of outcome (area under curve for FOUR score assumed to be 0.8), the sample size calculation was done using MedcalcR version 9.2.0.1. The correlation between both the scores and outcome was assumed to be 0.7. Keeping α-level as 0.05 and β-level as 0.20, the sample size was calculated to be 70.