Categorical Analysis:
Given these two breakpoints, and our two endpoints of 1986 and 2019, we
categorized the data into three time-based groups: 1986-1996, 1997-2003,
and 2004-2019 (Table 2).
Overall, the largest proportion of citations were neutral (45.4%). The
majority were accurate (78.9%), non-attributive (78.3%),
non-agenda-setting (59.9%), and non-empirical articles (57.7%).
Moreover, the majority of articles were published in the U.S. and Canada
(69.7%). Articles were published in a wide range of research areas,
although papers were concentrated within the areas of neurosciences &
neurology (22.6%) anesthesiology (16.2%), and general & internal
medicine (15.3%).