Statistical analysis
Statistical analysis was performed using Statistical program R 3.6 version and R Studio 1.2.1335, version. The sample size was calculated by r package (”MKmisc”), with command power. diagnostic.test, for diagnostic test with sensitivity of 0.95, specificity of 95 Significant level = 0.05, delta = 0.1, power = 0.8 as suggested by Cohen. The sample size required was 68 patients. We decided to remain with 60 patients as it does not alter the statistical power. The distribution of continuous data was assessed by Shapiro-Wilk’s test, a comparison of capillary Hemoglobin, lactate, and shock index values between severe and non-severe haemorrhage groups was done by t-Test in case of normal distribution and Wilcox test for non-normal distribution data. A Receiver Operating Curve analysis was done to determine cut points, Sensitivity, specificity, and performance of each test at 0, 15, and 30 minutes from the diagnosis.