Table 3 Results of statistical analysis from the two general linear models for the calculated bone density and the relative error, showing the F- and p-values for the remaining effects. Interaction effects are indicated by an asterisk between the individual effects. Note that non-significant effects can remain part of the model if they appear in significant interaction effects (i.e. Repetition).

From: Asynchronous calibration of quantitative computed tomography bone mineral density assessment for opportunistic osteoporosis screening: phantom-based validation and parameter influence evaluation

Independent effect(s)

F-value

p-value

Calculated bone density

  

Tube voltage

168.23

 < .0001

CT scanner

35.61

 < .0001

Tube voltage*CT scanner

23.32

 < .0001

Insert

2796.79

 < .0001

Tube voltage*Insert

48.74

 < .0001

CT scanner*Insert

15.67

 < .0001

Tube voltage*CT scanner*Insert

10.66

 < .0001

Repetition

3.76

0.0528

Tube voltage*Repetition

2.83

0.0928

Repetition*CT scanner

10.35

 < .0001

Tube voltage*Repetition*CT scanner

7.41

 < .0001

Relative error

  

Tube voltage

458.8

 < .0001

CT scanner

45.49

 < .0001

Tube voltage*CT scanner

30.65

 < .0001

Insert

20.1

 < .0001

Tube voltage*Insert

801.83

 < .0001

CT scanner*Insert

34.92

 < .0001

Repetition

2.82

0.0931

Tube voltage*Repetition

1.82

0.1772

Repetition*CT scanner

8.7

 < .0001

Tube voltage*Repetition*CT scanner

5.78

0.0006

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