
Introduction: The Burnout syndrome is understood as a low resilience to face work stress. Objective: To identify factors and constructs associated with Burnout and its overall prevalence in nursing assistants in a reference hospital of medium and high complexity level from Colombia. Materials and methods: A case-control study was conducted on 183 nursing assistants from a hospital. The Maslach instrument and Log-Binomial regression were used to identify associated factors, determining their Odds Ratios (OR). Results: The factors found associated with Burnout that increase its probability of occurrence are: working more than 48 hours a week (OR=1.02 (1.01-1.05) 90% CI) and feeling negatively about the work being done (OR=3.87 (1.18-10.71)). However, sleeping 7 or more hours a day reduces such probability (OR=0.70 (0.53-0.91)). The total Burnout prevalence was 44.7%, the main causes being personal fatigue (11.8%), depersonalization (14.9%), and poor personal fulfillment (47.81%). Conclusions: Associated factors, such as not getting enough sleep and feeling negatively about the work being done, increase the probability to develop Burnout, while this probability decreases by sleeping 7 or more hours a day. These findings will facilitate the implementation of institutional control measures.