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Table 2 Intra-class correlation coefficients (ICC), 95% confidence intervals (CI), means Bland-Altman (B-A) limits of agreement and standard error of measurement (SEM) for cortical and trabecular densitometry of 12 ft bones (n = 10)

From: Computed tomography derived bone density measurement in the diabetic foot

 

ICC

95% CI

Mean (HU) Session 1

Mean (HU) Session 2

B-A Lower Limit

B-A Upper Limit

SEM

Trabecular

 Talus

0.91c

0.67, 0.98

457.88

491.11

−43.46

109.92

10.17

 Calcaneus

0.90c

0.64, 0.97

231.85

246.37

−50.59

79.63

9.1

 Navicular

0.70b

0.17, 0.92

367.88

386.1

−123.27

159.70

34.25

 Cuboid

0.68b

0.47, 0.91

227.12

223.4

−99.76

92.32

24.01

 Medial cuneiform

0.83c

0.46, 0.96

371.71

378.28

−125.75

138.89

24.12

 Intermediate cuneiform

0.88c

0.58, 0.97

498.84

493.5

−130.90

120.22

19.23

 Lateral cuneiform

0.86c

0.54, 0.96

373.96

355.08

−123.68

85.92

17.34

 First metatarsal

0.90c

0.66, 0.98

248.28

237.65

−82.08

60.83

9.99

 Second metatarsal

0.81c

0.40, 0.95

309.19

317.91

−137.69

155.14

28.21

 Third metatarsal

0.82c

0.44, 0.95

280.1

281.72

−100.64

103.87

19.18

 Fourth metatarsal

0.69b

0.15, 0.91

268.5

271.72

−128.62

135.06

32.45

 Fifth metatarsal

0.85c

0.50, 0.96

252.35

275.59

−74.44

120.93

16.72

Cortical

 Talus

0.52b

−0.12, 0.85

2987.09

3111.51

−762.81

1011.66

271.73

 Calcaneus

0.59b

−0.21, 0.88

2764.06

2693.04

−775.28

633.26

199.35

 Navicular

0.70b

0.18, 0.92

2823.12

2779.88

−578.67

492.18

129.64

 Cuboid

0.69b

0.16, 0.91

2573.46

2862.21

−380.13

957.64

161.96

 Medial cuneiform

0.17

−0.48, 0.70

2728.22

2672.93

−1006.28

895.71

382.99

 Intermediate cuneiform

0.46b

−0.20, 0.83

2699.67

2735.92

−554.57

627.08

191.93

 Lateral cuneiform

−0.18a

−0.71, 0.47

2668.16

2717.88

−1007.55

1106.99

507.69

 First metatarsal

0.61b

0.01, 0.89

2897.07

2929.04

−633.15

697.11

183.62

 Second metatarsal

−0.17a

−0.70, 0.48

2872.36

2894.9

−960.78

1005.87

470.19

 Third metatarsal

0.22

−0.44, 0.72

2719.87

2892.68

−674.17

1019.79

330.67

 Fourth metatarsal

−0.03a

−0.62, 0.58

2728.13

2791.24

−974.57

1100.79

525.02

 Fifth metatarsal

0.37

−0.30, 0.80

2704.72

2716.83

−763.82

788.04

272.25

  1. HU Hounsfield units
  2. a the ICC obtained was negative due to greater intra-group variation than between group variation in that bone
  3. The measurement is unreliable bfair to good reliability, cexcellent reliability