Table 3 Clinical outcomes and radiological data between no/mild and moderate/severe periodontitis groups

VAS neck pain

5.12 ± 0.95

4.45 ± 1.19

4.87 ± 1.08

JOA

12.17 ± 1.77

12.50 ± 1.79

12.30 ± 1.77

NDI

27.41 ± 4.30

22.05 ± 9.17

25.43 ± 6.97

Duration of pain (weeks)

55.13 ± 16.22

52.23 ± 14.22

54.88 ± 17.31

Pfirrmann grade of disc degeneration

No degeneration

46 (67.6)

24 (60.0)

70 (64.8)

Degeneration

22 (32.4)

16 (40.0)

38 (35.2)

Endplate change

Yes

10 (14.7)

20 (50.0)

30 (27.8)

No

58 (85.3)

20 (50.0)

78 (72.2)

ROM (°)

C2-3

3.57 ± 2.41

3.17 ± 2.39

3.42 ± 2.39

C3-4

3.35 ± 1.93

4.13 ± 2.03

3.64 ± 1.98

C4-5

3.71 ± 2.51

3.99 ± 2.82

3.82 ± 2.60

C5-6

4.34 ± 2.00

3.68 ± 1.91

4.07 ± 2.04

C6-7

2.99 ± 1.70

3.64 ± 2.27

3.23 ± 1.93

Cervical lordosis

16.30 ± 7.66

15.21 ± 6.59

15.89 ± 7.23

Disc height (mm)

C2-3

  Anterior

5.39 ± 0.98

5.47 ± 1.88

5.42 ± 1.36

  Middle

7.08 ± 0.81

6.97 ± 1.15

7.04 ± 0.94

  Posterior

5.00 ± 0.89

5.20 ± 1.92

5.07 ± 1.35

C3-4

  Anterior

5.30 ± 1.15

5.35 ± 1.17

5.32 ± 1.15

  Middle

6.45 ± 0.96

6.38 ± 1.21

6.42 ± 1.05

  Posterior

4.63 ± 1.10

4.43 ± 1.06

4.56 ± 1.08

C4-5

  Anterior

5.76 ± 1.46

5.31 ± 1.21

5.59 ± 1.37

  Middle

6.22 ± 1.57

5.81 ± 1.71

6.07 ± 1.62

  Posterior

4.30 ± 1.17

4.48 ± 1.05

4.37 ± 1.11

C5-6

  Anterior

5.29 ± 1.16

5.00 ± 1.02

5.19 ± 1.11

  Middle

5.96 ± 1.62

5.43 ± 1.44

5.76 ± 1.56

  Posterior

4.33 ± 1.40

4.31 ± 0.91

4.32 ± 1.24

C6-7

  Anterior

5.48 ± 1.06

5.45 ± 1.60

5.43 ± 1.24

  Middle

5.81 ± 1.64

6.10 ± 1.41

5.91 ± 1.55

  Posterior

4.34 ± 1.01

4.46 ± 0.92

4.38 ± 0.97