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Table 8 Kruskal–Wallis rank test for the relationship between categorical CT scan variables and Diagnostic Reference Level estimates

From: Adult Computed Tomography examinations in Uganda: Towards determining the National Diagnostic Reference Levels

 

kVp

Slice thickness (mm)

Chi-square

p-value

Degree of freedom

Chi-square

p-value

Degree of freedom

Overall

CTDIvol mGy

10.578

0.0050**

2

246.021

0.0001**

10

DLP mGy.cm

21.127

0.0001**

2

106.396

0.0001**

10

Head CT

CTDIvol mGy

56.744

0.0001**

1

115.026

0.0001**

6

DLP mGy.cm

46.365

0.0001**

1

74.473

0.0001**

6

Chest CT

CTDIvol mGy

1.302

0.2539

1

2.752

0.4315

3

DLP mGy.cm

1.511

0.2190

1

18.838

0.0003**

3

Abdomen CT

CTDIvol mGy

7.119

0.0284**

2

68.116

0.0001**

3

DLP mGy.cm

4.969

0.0834**

2

48.711

0.0001**

3

Lumbar spine CT

CTDIvol mGy

4.176

0.0410**

1

9.991

0.0068**

2

DLP mGy.cm

3.688

0.0548

1

4.203

0.1223

2

  1. **significant relationship
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