Fig. 3: Proportions of sample 1 articles discussing certain types of variables according to their latent class.

Latent classes were named based on their most salient characteristics: DC in situational contexts with study-specific variables (STUDSPEC), DC in context with education and pedagogical variables’ (EDUPED) and DC in context of digital divide variables (DIGDIV). ‘Total’ represents the 230 articles of sample 1.