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Table 2 Summary of estimates from multivariable linear regression models examining the simultaneous association between predictor variables and outcomes

From: Treatment duration and factors associated with the surgery-first approach: a two-center study

Predictor variables Outcome is treatment time Outcome is number of visits
Estimate (95 % CI) p value Estimate (95 % CI) p value
Age (each 1 unit increase) 0.02 (−0.14–0.19) 0.78 0.14 (−0.04–0.32) 0.12
Gender   0.22   0.65
 Male 1.86 (−1.14–4.86) 0.72 (−2.49–3.92)
 Female Reference Reference
Type of malocclusion     
 Class I 1.59 (−2.62–5.80) 0.45 −1.38 (−5.87–3.12) 0.54
 Class II −5.83 (−10.92 to −0.75) 0.02 −4.55 (−9.98–0.87) 0.10
 Class III Reference Reference
Vertical pattern     
 Dolicofacial −2.95 (−6.35–0.44) 0.44 −1.46 (−5.08–2.16) 0.42
 Brachifacial 6.53 (−1.26–14.32) 14.32 5.37 (−2.95–13.69) 0.20
 Normofacial Reference Reference
Transverse expansion   0.001   0.009
 Yes 10.21 (4.26–16.17) 8.64 (2.29–15.00)
 No Reference Reference
Significant asymmetry   0.99   0.55
 Yes 0.01 (−3.28–3.30) −1.04 (−4.55–2.47)
 No Reference Reference
3D Plan   0.12   0.07
 Yes −3.44 (−7.77–0.90) −4.25 (−8.87–0.38)
 No Reference Reference
Type of surgery   0.47   0.92
 Two jaws −1.10 (−4.14–1.93) 0.16 (−3.08–3.40)
 One jaw Reference Reference
Use of TADs   0.65   0.33
 Yes 0.83 (−2.82–4.48) 1.90 (−2.00–5.80)
 No Reference Reference
Genioplasty   0.79   0.83
 Yes 0.41 (−2.75–3.58) −0.35 (−3.73–3.02)
 No Reference Reference
Center   0.31   0.03
 USA 1.95 (−1.85–5.74) 6.36 (2.31–10.41)
 Colombia Reference Reference