Here are five things to know:
1. Researchers obtained data from 35,409 hip fracture patients who underwent operations between July 2005 and December 2013.
2. The independent effect of winter operations and the hazard of mortality were calculated using the Cox regression hazard model.
3. More hip fracture operations occurred in the winter months. Mortality rates at selected intervals were:
- One month: 3 percent
- Six months: 11 percent
- One year: 17 percent
- Five years: 47 percent
4. Winter operations were associated with a higher hazard of mortality.
5. Higher mortality rates were also exhibited among:
- Men
- Elderly patients (85 years old and up)
- Patients who experienced longer surgical delay
- Patients with a high CCI
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