Estimates of the output of these journals have ranged from a high of 450,000 articles as of 2015 (as per the BMC Medicine study) to a low of 135,000 articles (as per research by Walt Crawford).
Is it important to give an assessment of the quality of these estimates? Giving a range leads to 'on one hand maybe its not so big...on the other' and different camps will gravitate to the numbers which serve their purpose. Even giving some description of how the numbers were arrived at might help drive consensus to a narrower range which could be productive?