an increasing trendP <.001
All sentiments in “negative emotions” display an increasing trend, with anxiety (n=114,234, 18.59%, β 1 =0.12%, P <.001) and anger (n=106,767, 17.38%, β 1 =0.17%, P <.001) showing relatively strong upward trends compared with sadness (n=23,609, 3.84%, β 1 =0.05%, P <.001).