Statistical analysis
This
study is an observational study. Descriptive statistics are presented as
the mean and standard deviation (SD) and median and interquartile range
(IQR) when appropriate. Interobserver agreement was analyzed by
calculating intraclass correlation coefficients for the composite
SISASR and the three SISTE.
Item-level interobserver agreement was assessed by calculating Cohen’s κ
statistic and the percentage of absolute agreement. A value of 0.7 was
taken as an acceptable level of agreement for both the ICC and Cohen’s
κ, preferably for the lower border of the 95% CI.