Statistical analysis
Statistical analysis was performed using the SPSS software (IBM
Statistical Package for the Social Science Statistics, version 24.0,
Chicago, IL). The normality of the data distribution was assessed by the
Kolmogorov-Smirnov test. Values were expressed as means ± standard
deviation (SD) for continuous variables, median and interquartile range
(IQR) for nonparametric data, or number and percentage (%) for
categorical variable. The Mann-Whitney test and Student’s t test were
used to compare nonparametric and normal data respectively while the χ2
was used to compare categorical variables. The rescued images were
subsequently reviewed by the same operators who defined the score.
Inter-observer reliability with Cohen’s kappa was defined: .81 ± 1.00
excellent, .61 ± .80 good, .41 ± .60 moderate, .21 ± .40 fair,
> 0 ± .20 slight, and 0 absent. A p value < .05
was considered statistically significant.