ABSTRACT
The COVID-19 pandemic has presented a threat to mental health worldwide. The current study aims to investigate the role of intolerance of uncertainty in cognitive, emotional and behavioral reactions to this pandemic and propose a path model of these reactions. In the first two months of the COVID-19 pandemic in Slovakia, participants in a general sample (n = 1,011) as well as an older adult sample (n = 655) completed measures regarding intolerance of uncertainty, mental health (anxiety, well-being, perceived stress) and adherence to preventive measures. Two rounds of data collection were carried out in the first sample. Intolerance of uncertainty was found to be related to mental health indicators and the structural equation model showed a direct and indirect effect on them as well as on the adherence to preventive measures. However, the comparison of data from different time points has brought inconsistent results. The findings highlight the role of intolerance of uncertainty in reaction to threat and indicate the potential of uncertainty reduction e.g., getting clear messages from authorities, as a way of decreasing mental health problems.