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Table 4 Comparison of paraspinal muscle characteristics between the union group and the nonunion group in subgroup analysis according to fusion length

From: Fat infiltration of paraspinal muscles as an independent risk for bone nonunion after posterior lumbar interbody fusion

 

One or two-level Fusion Group

Three or More Level Fusion Group

Union Group (n = 252)

Nonunion Group (n = 30)

p-value

Union Group (n = 49)

Nonunion Group (n = 20)

p-value

Age (year)

59.65 ± 6.55

62.57 ± 7.61

0.039

62.92 ± 5.92

65.45 ± 6.48

0.213

Sex (male/female)

90/162

12/18

0.644

24/25

11/9

0.65

BMI (kg/cm2)

26.25 ± 3.36

25.79 ± 3.44

0.49

25.34 ± 2.98

26.62 ± 3.53

0.158

Number of fusion levels

1.5 ± 0.5

1.87 ± 0.35

< 0.001

3.22 ± 0.42

3.3 ± 0.47

0.516

Fusion to S1 (yes)

88/252

15/30

0.105

22/49

14/20

0.058

Mean HU value of L1-4

128.41 ± 40.8

114.27 ± 32.3

0.116

130.74 ± 39.47

112.93 ± 41

0.097

Smoking (yes)

34

9

0.028

9

4

0.56

MF FI

0.27 ± 0.11

0.34 ± 0.11

0.001

0.29 ± 0.15

0.3 ± 0.1

0.338

ES FI

0.21 ± 0.1

0.24 ± 0.07(0.23 ± 0.02)

0.014

0.24 ± 0.11

0.22 ± 0.09

0.579

MF rTCSA

0.49 ± 0.14

0.49 ± 0.25

0.206

0.45 ± 0.12

0.41 ± 0.14

0.195

ES rTCSA

0.75 ± 0.19

0.77 ± 0.26

0.773

0.7 ± 0.22

0.72 ± 0.23

0.771

PS rFCSA

0.58 ± 0.16

0.54 ± 0.14

0.261

0.57 ± 0.17

0.56 ± 0.15

0.853