“…Weibull models have been used to evaluate life expectancy or time to event in the literature. [4,8,9] The models were adjusted for age, gender, race, Census region (Northeast, Midwest, South, West), receipt of public support for Medicare premium (state Medicare buy-in), patient health status (Charlson index and specific comorbidities), type of diagnosed fracture (pathologic, traumatic), site of service (inpatient or outpatient), per capita income (based on county of residence), physician specialty (orthopaedic surgeon, neurosurgeon, interventional radiologist, other), year of diagnosis and type of treatment (non-operated vs operated, kyphoplasty vs vertebroplasty vs non-operated).…”