Table 1 Demographic data

Number of samples

18

16

15

Mean age (years)

52.4 ± 14.8

56.1 ± 9.6

53.9 ± 11.1

0.663

Male/female

9/9

8/8

9/6

0.812

Smoker

0

1

0

Hypertention

2

5

1

0.233

Diabetes mellitus

2

1

2

0.856

Duration of clinical follow-up (months)

45.4 ± 5.8

35.5 ± 13.0

21.1 ± 4.4

0.000

Duration of radiological follow-up (months)

10.2 ± 7.8

9.5 ± 5.3

7.8 ± 3.0

0.491

 Single segment

9

4

9

 Double segments

8

11

4

 Three segments

1

1

1

Single segment fusion/two or three segment fusion

9/9

4/12

9/6

0.127

 Single segment

67.8 ± 33.1

40.0 ± 11.5

45.6 ± 59.8

0.469

 Double segments

83.7 ± 41.0

91.8 ± 90.1

32.5 ± 20.6

0.349

 Three segments

100 ± 0.0

150 ± 0.0

100.0 ± 70.7

 Total

76.7 ± 36.1

82.5 ± 80.0

49.3 ± 54.3

0.257

The duration of operation

 Single segment

75.6 ± 11.6

101.0 ± 56.8

61.7 ± 20.2

0.220

 Double segments

118.1 ± 19.4

94.1 ± 13.8

82.5 ± 13.2

0.002

 Three segments

170.0 ± 0.0

125.0 ± 0.0

113.5 ± 9.2

 Total

99.7 ± 31.3

97.75 ± 28.9

74.1 ± 24.8

0.028

Types

0.544

 Cervical spondylotic myelopathy

9

6

11

 Cervical spondylotic radiculopathy

7

9

4

 Mixed cervical spondylosis

2

1

0

Length of hospital stay after operation(days)

6.2 ± 2.0

5.8 ± 1.7

5.6 ± 1.3

 Single segment

47805 ± 3524

47098 ± 2426

49568 ± 9089

0.765

 Double segments

77623 ± 4481

74215 ± 3186

79645 ± 4026

0.044

 Three segments

120404 ± 0

11249 ± 0

109499 ± 6076

 Total

65091 ± 20644

69750 ± 16559

65579 ± 23456

0.773