Sign
Categorically, there was a substantial and continuous decrease in
affirmational citations over the three periods (50.4% to 38.6% to
25.4%). The decrease in affirmation from the first to the second
periods was driven by an increase in neutral articles while the decrease
in affirmation from the second to the third periods was driven by an
increase in negational articles. Agenda-setting was significantly higher
in negational (41.6%) and neutral (48.3%) articles than affirmational
(28.7%) articles (Supplementary File 2).