Table 7

Average values of T₂ parameters in the incidence and control groups

Parameter

Compartment^a

Incidence group (n = 92)

Control group (n = 53)

P value unadjusted

P value adjusted^b

Coefficient^c

95% confidence interval

T₂

Mean, ms

All

32.65 ± 1.55

32.07 ± 1.38

0.056

0.018

-0.72

-1.31

-0.12

MF

37.68 ± 2.28

36.85 ± 2.16

0.042

0.003

-1.18

-1.94

-0.42

MT

30.27 ± 1.88

29.51 ± 1.77

0.029

0.036

-0.72

-1.39

-0.04

GLCM

Contrast

All

248.67 ± 38.39

227.41 ± 35.00

0.005

0.003

-22.81

-37.48

-8.13

MF

364.17 ± 68.98

333.37 ± 66.58

0.013

0.009

-32.97

-57.72

-8.21

MT

257.30 ± 63.19

226.96 ± 47.83

0.004

0.013

-25.40

-45.49

-5.48

Entropy

All

6.34 ± 0.16

6.30 ± 0.19

0.142

0.286

-0.03

-0.10

0.03

MF

6.96 ± 0.17

6.90 ± 0.17

0.055

0.062

-0.06

-0.12

0.003

MT

6.17 ± 0.28

6.09 ± 0.34

0.050

0.127

-0.07

-0.15

0.02

Variance

All

187.77 ± 26.69

171.74 ± 24.57

0.003

0.002

-16.60

-27.09

-6.27

MF

255.64 ± 42.38

233.10 ± 38.60

0.003

0.001

-24.86

-39.82

-9.91

MT

183.65 ± 37.88

162.66 ± 32.01

0.001

0.005

-17.89

-30.31

-5.47

^aAll, average of all compartments: medial femur (MF), medial tibia (MT), lateral femur, lateral tibia, and patella. ^bP value adjusted for age, gender, and body mass index (BMI). ^cThe coefficient is the difference in the T₂ parameter between the incidence and control groups, adjusted for age, gender, and BMI. A coefficient below 0 indicates that the control group has a lower estimated T₂ parameter in comparison with the incidence group. GLCM, grey level co-occurrence matrix.

Joseph et al. Arthritis Research & Therapy 2011 13:R153   doi:10.1186/ar3469