Table 3 Wald χ2 test results from the Linear Mixed-Effects Model.

From: In vitro study of retention forces in traditional and PEEK milled ball attachments with two retentive caps

Effect

χ2

df

P-value

Ball material

0.35

1

0.55

Cap material

60.94

1

 < 0.001*

Time

146.68

4

 < 0.001*

Ball × Cap

0.21

1

0.64

Ball × Time

4.72

4

0.32

Cap × Time

127.10

4

 < 0.001*

Ball × Cap × Time

16.48

4

0.0024*

  1. *Statistically significant.
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