Key clinical point: Divergent public health responses in Spain and China had significant mental health impact.

Major finding: Routine use of face masks during the pandemic was associated with lower levels of depression, anxiety, and psychological stress in China but not in Spain.

Study details: This was a detailed Internet survey addressing mental health issues in 1,539 Spanish and Chinese individuals during the first wave of the COVID-19 pandemic.

Disclosures: The presenter reported having no financial conflicts regarding the study, conducted free of commercial support.