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Effects of COVID-19 pandemic on OCD symptoms among university students: a prospective survey.

BACKGROUND
The COVID-19 pandemic is associated with common mental health problems. Evidence of the association between fear of COVID-19 and obsessive-compulsive disorder (OCD) is limited.


OBJECTIVE
This study aimed to examine if fear of negative events affects the score of Yale-Brown obsessive compulsive scale (Y-BOCS) in a COVID-19-fear-invoke environment.


METHODS
All participants were medical university students and voluntarily completed three surveys via smart-phone or computer. Survey 1 was conducted on Feb. 8, 2020 after two-week quarantine without online courses, Survey 2 was conducted on March 25, 2020 when participants had been taking online courses for two weeks, and Survey 3 on April 28, 2020 when no new case had been reported for two weeks. We used a battery of questionnaire in Surveys, including basic information (age, gender, having sibling, enrollment year, major), knowledge on COVID-19 (0 for 'do not know' and 3 for 'very knowledgeable', The fear (0 for 'no fear' and 9 for 'extreme fear'), Y-BOCS, and Zung Self-Rating Anxiety Scale (SAS).


RESULTS
Survey 1 showed that 1519 of 13478 (11.3%) participants scored ≥16 on Y-BOCS, defined as possible OCD. Survey 2 and Survey 3 demonstrated 3.6% (305 of 8162) and 3.5% (305 of 8511), respectively. The Y-BOCS score, anxiety level, quarantine level, and intensity of fear were significantly lower at Surveys 2 and 3 than that at Survey 1 (P<.001 for all). Compared to those with a lower Y-BOCS score (<16), participants with possible OCD had higher intensity of fear and SAS standard score (P<.001). The regression linear analysis indicated that the intensity of fear was positively correlated to the rate of possible OCD and the average total scores for Y-BOCS in each survey (P<.001 for all). Multiple regressions indicated that those with higher intensity of fear, higher anxiety level, are male, have sibling(s), and majored in non-medicine predicted higher Y-BOCS score in all surveys. These results were re-demonstrated in 5827 matched participants of Survey 1 and Survey 2 and in 4006 matched participants from three surveys. Furthermore, in matched participants, the Y-BOCS score was negatively correlated to the changes of the intensity of fear (r=0.63 for Survey 2 and 0.74 for Survey 3, P<.01).


CONCLUSIONS
Our findings indicated that the fear of COVID-19 was associated with the increase of Y-BOCS score, suggesting that environment x psychology interaction might be involved in OCD and that a fear of negative events might play a role in the etiology of OCD.


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