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Table 4 Multivariable analysis evaluating the impact of SL brackets on rRR and sEARR

From: Root resorption, treatment time and extraction rate during orthodontic treatment with self-ligating and conventional brackets

  rRRa sEARRb
Parameter estimate (β)c p-value 95% CI ORd p-value 95% CI
SL -0.86 0.33 -2.59; 0.87 0,92 0.91 0.24; 3.50
Non-SL 0e    0e   
  1. arepeated measures mixed linear model adjusted for gender, age, treatment duration, amount of extraction, treatment mechanic, location of the tooth, and interaction between tooth location and self-ligating brackets. brepeated measures binary logistic regression adjusted for gender, age, and treatment duration, cregression coefficient: average difference in rRR between the Non-SL (reference group) and the SL group (comparison group), dOdds ratio: chance of sEARR occurring in the SL group compared to the chance of sEARR occurring in the Non-SL group. An OR of 1 indicate equal chances in both groups, OR > 1 indicate higher chance in the SL vs. non-SL group, OR < 1 indicate lower chance in the SL vs. Non-SL group, eReference category.
  2. CI confidence interval, OR: odds ratio, rRR: relative root resorption, sEARR: severe external apical root resorptions, SL: self-ligating.