*2.4. Data Analysis*

The Kappa index (*k*) was used for the cross-cultural validation of the questionnaire. The nonparametric Kendall W test was considered for consensus by expert judgement (*n* = 10). Similarly, the INFLESZ Scale, to evaluate the readability of written texts, was considered to quantify the degree of difficulty in the translation. The expert judgement for validation provided significant input for fitting the scale (*n* = 10; W: 0.991, *p* < 0.01). After that, the research team debated on these contributions to reach a consensus on the grammatical, linguistic, semantic and legibility dimensions of the scale, measuring the legibility throughout the INFLESZ Scale, obtaining a value >0.40.

All of the statistical analyses were performed using the Statistical Package for the Social Sciences (SPSS, version 22) (IBM, Armonk, NY, USA), licensed by the Universidad de Castilla-La Mancha. The Kolmogorov–Smirnov test (*n* > 50) displayed a normal distribution of the sample. A descriptive analysis of the data was carried out obtaining Cronbach's alpha, as well as Pearson's correlations between measures and the analysis of the variance (ANOVA: analysis of the differences between the members of the groups based on the procedures developed by Fisher) for independent samples, to study the differences in the "academic year" variable, as suggested by Lloret-Segura, Ferreres-Traver, Hernández-Baeza and Tomás-Marcos [34]. A confirmatory factorial analysis has also been performed using structural equations with EQS Structural Equation Modelling Software, version 6.1 (MVSOFT, Los Angeles, CA, USA).
