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Table 3 FDG uptake versus PYP uptake in the muscles of seven IIM patients. (a) SUVmean and (b) SUVmax

From: Treatment-naïve idiopathic inflammatory myopathy: disease evaluation by fluorodeoxyglucose versus pyrophosphate

 

FDG uptake

PYP uptake

Difference FDG–PYP

95% CI

p value

Ratio FDG/PYP

95% CI

p value

(a)

      

Upper limb

      

 M. deltoideus dx

1.11 ± 0.30

0.38 ± 0.14

0.73 ± 0.19

(0.56–0.90)

< 0.0001

2.91 ± 0.48

(2.47–3.35)

< 0.0001

 M. biceps dx

1.35 ± 0.41

0.37 ± 0.17

0.98 ± 0.31

(0.69–1.27)

0.0002

3.65 ± 1.17

(2.56–4.74)

0.001

 M. triceps dx

0.91 ± 0.22

0.31 ± 0.12

0.60 ± 0.18

(0.43–0.77)

0.0001

2.93 ± 0.91

(2.09–3.77)

0.001

Lower limb

      

 M. gluteus maximus dx

0.77 ± 0.12

0.33 ± 0.03

0.44 ± 0.11

(0.33–0.54)

< 0.0001

2.31 ± 0.32

(2.02–2.60)

< 0.0001

 M. quadriceps femoris dx

0.84 ± 0.08

0.31 ± 0.03

0.53 ± 0.07

(0.47–0.60)

< 0.0001

2.74 ± 0.18

(2.57–2.91)

< 0.0001

Derived variable

      

 Volume-weighted average SUVmean for all upper limb muscles

1.10 ± 0.17

0.36 ± 0.11

0.74 ± 0.13

(0.62–0.87)

< 0.0001

3.07 ± 0.76

(2.37–3.77)

0.0004

 Volume-weighted average SUVmean for all lower limb muscles

0.80 ± 0.07

0.32 ± 0.02

0.48 ± 0.07

(0.42–0.54)

< 0.0001

2.49 ± 0.23

(2.28–2.71)

< 0.0001

 Volume-weighted average SUVmean for all muscles

0.87 ± 0.08

0.33 ± 0.03

0.54 ± 0.07

(0.47–0.60)

< 0.0001

2.62 ± 0.26

(2.38–2.85)

< 0.0001

(b)

      

Upper limb

      

 M. deltoideus dx

2.42 ± 0.57

0.93 ± 0.30

1.49 ± 0.45

(1.08–1.90)

0.0001

2.60 ± 0.65

(2.01–3.20)

0.0006

 M. biceps dx

3.94 ± 3.20

1.04 ± 0.50

2.90 ± 2.76

(0.34–5.45)

0.03

3.79 ± 1.66

(2.26–5.32)

0.004

 M. triceps dx

1.92 ± 0.51

0.78 ± 0.21

1.13 ± 0.45

(0.72–1.55)

0.0005

2.45 ± 0.68

(1.82–3.08)

0.001

Lower limb

      

 M. gluteus maximus dx

2.78 ± 2.26

1.17 ± 0.26

1.61 ± 2.04

(− 0.28–3.50)

0.08

2.38 ± 1.52

(0.97–3.78)

0.05

 M. quadriceps femoris dx

2.34 ± 0.72

1.03 ± 0.30

1.31 ± 0.59

(0.76–1.85)

0.001

2.26 ± 0.60

(1.71–2.81)

0.001

Derived variable

      

 Volume-weighted average SUVmax for all upper limb muscles

2.51 ± 0.68

0.91 ± 0.24

1.60 ± 0.61

(1.04–2.17)

0.0005

2.76 ± 0.79

(2.03–3.49)

0.001

 Volume-weighted average SUVmax for all lower limb muscles

2.59 ± 1.58

1.12 ± 0.21

1.47 ± 1.43

(0.15–2.80)

0.03

2.31 ± 1.13

(1.27–3.36)

0.02

 Volume-weighted average SUVmax for all muscles

2.57 ± 1.34

1.07 ± 0.20

1.50 ± 1.24

(0.35–2.64)

0.02

2.40 ± 1.05

(1.43–3.37)

0.01

  1. SUV Standardized uptake value (g/ml)