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This cross-sectional study reports the prevalence rate of probable post-traumatic stress syndrome (PTSD) and associated factors among French university students. A total of 22,883 students completed the online questionnaire. The prevalence rate of probable PTSD, assessed using the PTSD Checklist for DSM-5, was 19.5% [19.0\u201320.0]. Female (1.32 [1.21\u20131.45]) or non-binary gender (1.76 [1.35\u20132.31]), exposure to a non-COVID-19-related traumatic event (3.37 [3.08\u20133.67]), having lived through quarantine alone (1.22 [1.09\u20131.37]), poor quality of social ties (2.38 [2.15\u20132.62]), loss of income (1.20 [1.09\u20131.31]), poor quality housing (1.90 [1.59\u20132.26]), low-quality of the information received (1.50 [1.35\u20131.66]) and a high level of exposure to COVID-19 (from 1.38 [1.24\u20131.54] to 10.82 [2.33\u201376.57] depending on the score) were associated with PTSD. Quarantine was considered potentially traumatic by 78.8% of the students with probable PTSD. 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