COVID-19-related physical isolation, fear and anxiety determined de novo mental illnesses, by potentially facilitating the emergence of Hikikomori traits (i.e., a severe social withdrawal condition).

The present study aims at screening a cohort of university students for the Hikikomori traits and assessing a set of psychopathological determinants associated with Hikikomori, particularly boredom and loneliness dimensions.

A cross-sectional web-based survey was carried out by administering Hikikomori Questionnaire (HQ-11), Italian Loneliness Scale (ILS), Multidimensional State Boredom Scale (MSBS), Depression Anxiety Stress Scale (DASS-21) and Toronto Alexithymia Scale (TAS-20).

1,148 respondents (767 women and 374 men, mean age: 23.2±SD=2.8 years old) were recruited. 70.7% declared to have experienced psychological distress. HQ-11 average total score was 18.4±SD=7.5 with statistically significant higher values in the males (p=0.017) and amongst students studying Informatics, Mathematics/Physics/Chemistry, Science of Communication and Engineering. The HQ-11 positively correlated with ILS (r=0.609), MSBS (r=0.415), TAS-20 (r=0.482) and DASS-21 (r=0.434).

This study represents the first screening of the Hikikomori phenomenon in Italian university students. Hikikomori traits appear to be particularly represented in the Italian youth population and should be carefully investigated in future studies.

No significant relationships.

Hikikomori represents the severe social withdrawal condition of the so-called ‘modern type-depression” (MTD). Digital addictions, including Internet addiction (IA), Internet gaming disorder (IGD) and smartphone addiction, have been associated with MTD and Hikikomori.

This is a post-hoc study aimed at assessing digital addictions in a cohort of university students with a positive screening for MTD and Hikikomori.

A cross-sectional web-based survey was conducted by administering the Hikikomori Questionnaire (HQ-11), Internet Addiction Test (IAT), Internet Gaming Disorder Scale-Short-Form (IGDS9-SF) and the Smartphone addiction scale-Short Version (SAS-SV).

Among 1,148 respondents, a significant association was found between the HQ-11 scale and the DASS-21 total score (r=0.434). The HQ-11 positively correlated with IAT, IGDS9-SF and SAS-SV (r=0.329; r=0.292 and r=0.205 respectively).

Digital addictions appear to be widely diffuse among university students positive to the Hikikomori and MTD screening. Further longitudinal studies are needed to weight and balance the potential consequences of digital tools in Hikikomori subjects.

No significant relationships.