Statistical analyzes
Qualitative variables were described in terms of frequency and percentage. The note of theoretical radiographic knowledge of the residents has been described in terms of median and interquartile range.
The comparison of the radiographic theoretical knowledge scores of the residents between the two sessions was evaluated using a rank test signed of Wilcoxon.
The distribution of FHR evaluation grades was compared between the 2 sessions using a mixed ordinal regression model including the session as a fixed effect and an internal random effect to take into account the correlation between the different assessments by resident (27 scenarios, 2 sessions). To evaluate the impact of the training on the analyze of the FHR by the residents, the reproducibility of the responses between the 34 residents on the FHR graduation was evaluated using the Krippendorff’s alpha coefficient with its confidence interval of 95% [95% CI].
The FBS requested rate and the rate of correct estimation of the pH (if requested) were compared between the 2 sessions using a mixed logistic model including the session as a fixed effect and an effect internal random.
The p-values were calculated with a significance level of 5%. Statistical analyzes
were performed using the SAS software (SAS Institute version 9.4).