Table 2 Some of the factors that may affect long-term efficacy and their assignments

X1

Gender

Male(1), Female(0)

1 = 24, 0 = 67

X2

High blood pressure

Yes(1), No(0)

1 = 30, 0 = 61

X3

Diabetes

Yes(1), No(0)

1 = 5, 0 = 86

X4

Causes of injury

Falling(0), Car Accident(1)

Low fall(2), No obvious cause(3)

0 = 50, 1 = 8

2 = 7, 3 = 26

X5

Fracture segment

Lumbar(1), Thoracic(0)

1 = 51, 0 = 40

X6

Previous history

Yes(1), No(0)

1 = 4, 0 = 87

X7

Anti-osteoporosis treatment

Yes(1), No(0)

1 = 33, 0 = 58

X8

Vertebral re-fractures

Yes(1), No(0)

1 = 12, 0 = 79