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. Author manuscript; available in PMC: 2018 Mar 1.
Published in final edited form as: Am J Orthod Dentofacial Orthop. 2017 Mar;151(3):456–462. doi: 10.1016/j.ajodo.2016.08.021

Table II.

Odds of Extraction by Year, Adjusted for Potential Risk Factors in Table I*

Odds Ratio (OR) 95% Confidence Interval (95% CI) p-value
Overall Extractions by Year 0.91 (0.88, 0.95) <0.001
Overall Extractions by Year (Quadratic) 1.0 (1.00, 10.2) 0.066
Four First Premolar Extractions by Year 0.95 (0.90, 0.99) 0.017
*

Level of statistical significance set to p=0.05, Odds based on a logistic regression model for the likelihood of extraction, adjusted for all participant characteristics found in Table I