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Table 2 Sum scores divided in: correct (compliance with quality criteria), errors (no compliance with quality criteria) and stability (same quality in both radiographic series per clinic) in assessments for all clinics. Mean (95% CI) and presented in percentile (p) groups with a proposed grading: A-E

From: European guidelines on radiographic image quality in chiropractic practice – proposal of a cross-sectional graded classification reporting principle

 

Mean

95% conf. interval

Min

p10

p25

Median

p75

p90

Max

Correctd

Proposed scoringa

   

E

D

C

B

A

 

 All projections

33.56

(32.69 34.43)

14

25

31

34

37

40

43

 AP/PA

15.26

(14.88 15.65)

7

12

14

16

17

18

18

 L1-L4

9.45

(9.11 9.78)

3

7

8

9

11

12

14

 L5/S1

8.85

(8.50 9.21)

2

6

8

9

10

12

12

Errorc

Proposed scoringa

   

A

B

C

D

E

 

 All projections

10.42

(9.55 11.29)

1

4

7

10

13

19

30

 AP/PA

2.72

(2.34 3.10)

0

0

1

2

4

6

11

 L1-L4

4.55

(4.22 4.89)

0

2

3

5

6

7

11

 L5/S1

3.14

(2.79 3.50)

0

0

2

3

4

6

10

Stabilityb

Proposed scoringa

  

E

D

C

B

A

 

 All projections

5.20

(4.72 5.68)

0

2

3

5

7

9

14

 AP/PA

1.96

(1.70 2.21)

0

0

1

2

3

4

6

 L1-L4

1.76

(1.56 1.95)

0

0

1

2

2

3

5

 L5/S1

1.49

(1.28 1.69)

0

0

0

1

2

3

5

  1. aProposed cut point in grading A-E. Only used for the “all projections” group. A = highest grade
  2. bStability in quality measured as whether the two assessed radiographic series had the same scoring (ok versus error)
  3. cSum of errors in all assessments. d Sum of correct assessments. Classified in grades according to mean +/− SD criteria, see Materials and methods section