Table 4

Models using clinical, radiological and DXA variables

Variables

% Diff. & p

-2 Log

R²

AIC

AUC

TNR

TPR

1

KL score affected side:

30.7% (***)

159.5

0.31

163.5

0.76

93.2

37.2

2

DXA affected side:

184.2

0.15

192.2

0.69

97.3

9.3

- BMC medial part femoral head

13.9% (***)

- BMC inferior part femoral head

7.2% (***)

- BMC femoral neck

5%(*)

3

DXA affected side + KL:

148.6

0.38

158.6

0.83

93.9

34.9

- BMC medial part femoral head

13.9%(*)

- BMC inferior part femoral head

7.2%(*)

- BMC femoral neck

5%(**)

- KL affected side

NA(***)

4

KL affected side + Delta KL

154.0

0.35

160

0.82

93.9

34.9

- KL score affected side

NA(***)

- Delta KL

32%(*)

5

DXA ROI'S difference:

135.6

0.45

153.6

0.84

91.7

51.2

- Difference superior area fem head

16.5% (*)

- Difference trochanteric area size

2% (*)

- Difference BMD sup. part fem. head

5.7% (**)

- Difference BMC sup. part fem. head

9% (**)

- Difference BMD med. part fem. head

4.6% (**)

- Difference BMC med. part fem. head

4% (**)

- Difference Intertrochanteric area size

-4.5% (*)

- KL score affected side

NA(***)

The difference in values between affected hip and contralateral side is expressed in percentage (%). Positive values represent an increase in the affected hip. No applicable (NA) in the cases that the variable only reflect the affected side. Level of significance codes: '***' P value < 0.001, '**' P value < 0.01, '*' P value < 0.05. All models were corrected for patient characteristics. TPR and TNR columns correspond to the percentage correctly predicted by the models. *Area under the curve value obtained after 10-fold cross validation process.

AIC = An Information Criterion; AUC = areas under the curve; DXA = dual energy X-ray absorptiometry; KL = Kellgren and Lawrence score of the affected side; ROI = rate opf interest; TNR = true negative rate TPR = true positive rate

Castaño Betancourt et al. Arthritis Research & Therapy 2009 11:R162   doi:10.1186/ar2845