Table 5 Characteristics of the maxVB = 0, maxVB (2–8) and maxVB (9–17) groups adjusted for the confounding factors of bone fusion

maxVB = 0

—

—

maxVB (2–8)

13

2.7–62

0.001**

maxVB (9–17)

8.1

0.59–111

0.1

Age

0.93

0.85–1

0.1

Sex

0.81

0.14–4.7

0.8

Fracture types

A1

—

—

A3

0.29

0.01–8.8

0.5

A4

0.44

0.017–1

0.6

B1

0.57

0

1

B3

0.33

0

1

Smoking history

0.57

0.12–2.8

0.5

DM history

0.94

0.13–6.7

0.9

Femur proximal BMD (g/cm²)

1

0–23,680

1

Osteoporosis drugs

None

—

—

Bone formation stimulants

0.32

0.064–1.6

0.2

Bone resorption inhibitors

0.88

0.081–9.7

0.9

Others

0.62

0.022–18

0.8

Surgical techniques

Unilateral side screw fixation

—

—

Pedicle screw

0.91

0.15–5.5

0.9

Number of fixed vertebrae

1.000

0.53–1.9

1

Materials used for anterior props

Iliac bone

—

—

Expandable cage

2.5

0.33–17

0.4