Exhibit 173 · Peer-reviewed cohort study
The safety of inpatient health care
In a random sample of 2809 admissions, we identified at least one adverse event in 23.6%. Among 978 adverse events, 222 (22.7%) were judged to be preventable
Random sample of 2,809 admissions to 11 Massachusetts hospitals in 2018, screened by trained nurses with a trigger method and adjudicated by physicians. At least one adverse event occurred in 23.6 percent of admissions. Of 978 events, 222 (22.7 percent) were preventable and 316 (32.3 percent) were serious or worse. Preventable events affected 6.8 percent of admissions. Drug events were 39.0 percent of events, surgical or procedural 30.4, patient-care (including falls and pressure ulcers) 15.0, and health care-associated infections 11.9. Seven deaths occurred, one judged preventable. Funded by the Controlled Risk Insurance Company and the Risk Management Foundation of the Harvard Medical Institutions.
- Source
- Bates et al., New England Journal of Medicine 388(2):142–153
- Date
- 12 January 2023
- Quoted from
- Abstract, Results (N Engl J Med 388(2):142-153)
- Grade
- Peer-reviewed
- Document
- https://doi.org/10.1056/NEJMsa2206117
- Accessed
- 2026-11-09
- Cited by
- Findings citing this exhibit