Statistical Analysis
The data retrieved were recorded on Microsoft Excel spreadsheets
(Microsoft 365 Office ProPlus, Microsoft Inc.) and further analysed to
assess the relations between said economic parameters to scholar
productivity in each OECD country. SPSS version 21 (IBM, Chicago, Il)
was used for statistical analyses. Normal distribution of variables was
tested analytically by the Shapiro-Wilk test. Descriptive statistics are
presented as a mean ± standard deviation (SD) for normal distributed
variables and as a median with interquartile range (IQR) for non-normal
distributed variables. The correlation between economic and bibliometric
indicators was assessed by Pearson’s correlation or Spearman’s rank
correlation, as appropriate according to the normality test. The
analyses of the differences in academic productivity between native and
non-native English countries and between global regions were performed
using the Mann-Whitney test.