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Progress in Orthodontics

Table 1 Non-parametric MANCOVA on ABL (difference between pre- and post-treatment levels) at different mesiodistal locations (mesial or distal), and side memberships (space closure or control)

From: Effect of mandibular first molar mesialization on alveolar bone height: a split mouth study

 

d.f.

F

p

Covariate (patient)

1

0.18

0.677

Side

1

2.95

0.085*

Mesiodistal location

1

2.10

0.156

Side × mesiodistal location

1

0.95

0.339

Residual

95

  

Total

99

  

Comparison1

p

Mesial space closure vs. mesial control

0.042**

Distal space closure vs. distal control

0.639

  1. Two crossed factors and their interactions were analyzed in each case having “patient” as a covariate: mesiodistal location (fixed factor; 2 locations) and side membership (fixed factor; 2 sides)
  2. *Close to statistical significance level, p < 0.05
  3. 1Pair-wise a posteriori tests between side membership factor, within the levels of mesiodistal location factor
  4. **p < 0.05; Wilcoxon signed-rank test: p = 0.015
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