3 Statistical Analysis
Based on previously published data (10, 11), there are about five factors——gender, height, weight, BMI, BSA——related to the diameter of the distal radial artery. We calculated an effective sample size according to 10 events per independent variable principle(12).
Normally distributed continuous variables were expressed as mean ± standard deviation (SD), if they were normally distributed and compared using the independent-samples t-test. Abnormally distributed continuous variables were expressed as median (interquartile range (IQR)), and compared using the independent-samples nonparametric test. Categorical variables were expressed as frequency (percentage) and compared using the Chi-square test. Univariate and multivariate analyses were performed by logistic regression. Statistical analysis was performed using the SPSS 26.0 software (IBM, Armonk, NY, USA). P < 0.05 was considered statistically significant.