A general rule of thumb is that texts with Flesch index higher than 65 are considered accessible writing (DuBay, 2004), which is why a manual examination of all documents which fell under the threshold of 65 was performed.
certain documents with Flesch index lower than 65 were not discarded even though they included complex terms, because these terms had been adequately explained and the aim was to familiarise the readers with the jargon used in the genre.