*2.3. Psychological Profile*

We analyzed the students' perceived danger of the COVID-19 virus using a Likert scale from 0 to 10, where 0 means the least and 10 is the most. A Likert scale was also used to measure how the COVID-19 crisis has affected the participant personally, where 0 means the least and 10 the most. A reduced version of the Spanish version of the Big Five Inventory [19] was used to measure personality traits, including openness to experience, conscientiousness, extraversion, agreeableness, and neuroticism. The reduced version is composed of 10 items that are answered on a 5-point Likert scale, where 1 means completely disagree and 5 means completely agree. A reduced version of the Spanish version of Spielberger State-Trait Anxiety Inventory [20], composed of 6 items assessing anxiety that are answered on a 4-point Likert scale where 1 means not at all and 4 means very much, was used to measure anxiety. The Spanish version of the Acceptance and Action Questionnaire II [21] was used to analyze the experiential avoidance or psychological inflexibility through 7 items answered by a 7-point Likert scale, where 0 means never true

and 7 means always true. The Spanish version of the UCLA Loneliness Scale [22] was used to scale measures loneliness. In the present study, we used a condensed version which consists of 3 items answered by a 3-point Likert scale, where 1 means never and 3 means frequently. The Spanish version of Zung Depression Scale [23] was used to measure depression in relation to the COVID-19 crisis. The Zung Depression Scale uses a self-applied scale for depression, which has a sensitivity and specificity greater than 80% and consists of 20 items formulated in positive and negative terms. Somatic and cognitive symptoms are highly relevant, with 8 items for each group. The scale also includes 2 items referring to mood and 2 to psychomotor symptoms.
