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).