Operative Management Improves Near-term Survival of Patients With Odontoid Type II Fractures: A Propensity-matched National Registry Analysis.

Trauma center designation was not made available in the multivariate logistic regression analysis for calculating propensity scores due to >10% missing data, and ISS (polytrauma) was included because it was borderline significant ( P =0.014) Second, the propensity score was used to match operative and nonoperatively managed patients 1:1 based on caliper distance of 0.05.

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