Table 1 Non parametric MANCOVA on accuracy measurements (deviation between structures) performed with different settings, cleaning status, and measurement time points.

From: The effect of regular dental cast artifacts on the 3D superimposition of serial digital maxillary dental models

Factor

d.f.

F

P

Covariate (patient)

1

31.293

0.000*

Superimposition

2

18.269

0.000*

Setting

1

0.712

0.396

Cleaning

1

0.001

0.981

Time

1

0.017

0.897

Superimposition x Setting

2

0.347

0.703

Superimpostion x Cleaning

2

0.035

0.967

Superimposition x Time

2

0.005

0.994

Setting x Cleaning

1

0.014

0.908

Setting x Time

1

0.000

0.993

Cleaning x Time

1

0.001

0.971

Superimposition x Setting x Cleaning

2

0.069

0.934

Superimposition x Setting x Time

2

0.027

0.973

Superimposition x Cleaning x Time

2

0.019

0.981

Setting x Cleaning x Time

1

0.021

0.885

Superimposition x Setting x Cleaning x Time

2

0.005

0.995

Residual

215

  

Total

239

  

Comparison a

t

 

p – value

A vs. B

1.232

 

0.218

A vs. C

5.913

 

0.000*

B vs. C

5.128

 

0.000*

  1. Four crossed factors and their interactions were analyzed in each case having “patient” as a covariate: superimposition technique (fixed factor; 3 techniques), setting (fixed factor; 2 settings), cleaning (fixed factor; 2 status), and time (fixed factor; 2 measurement time points).
  2. 9999 permutations.
  3. *p < 0.05.
  4. aa posteriori pairwise tests between superimposition techniques.
  5. A, B, C correspond to the three superimposition techniques and reference areas tested in the study.
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