Objective: Verify demographic and clinical factors associated with patient safety incidents among elderly people in intensive care. Methods: Retrospective study of 112 medical records of elderly people admitted to an intensive care unit in 2015. The data were collected from January to June 2016, using: a form for population characterization; the Simplified Acute Physiology Score II; the Charlson Comorbidity Index and the International Classification for Patient Safety; analyzed by multiple linear regression (p < 0.05). Results: Length of stay increased all types of no harm incidents, general adverse events, clinical process/ procedure and infection. There was a higher number of nutrition-related no harm incidents among men, and administration-related adverse events among women. The age group of 69 to 70 years increased the number of medication-related no harm incidents. Hospitalization for clinical reasons increased behavior-related no harm incidents, whereas for surgical reasons it boosted the number of infection-related adverse events. Conclusion: Length of stay; sex; age group and hospitalization were associated with increased no harm incidents and adverse events.

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