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).