Statistical methods
Interrater reliability was determined for EIVC criteria and the DISCERN tool. The EIVC criteria was classed as an ordinal variable and the Fleiss-kappa statistical analysis was performed to determine the level of inter-observer reliability. The DISCERN tool was classed as a continuous variable and an interclass correlation co-efficient was calculated. The DISCERN score and essential video scoring criteria were then compared with the video metrics, source and type using a one-way Welch ANOVA test, Pearson’s product-moment correlation and Spearman’s rank-order correlation.
The Statistical analysis was done with the Statistical Package for Social Sciences (SPSS) 25 software package (SPSS Inc., Chicago, IL).