Table 2 Statistical analysis of the correlation between cervical pillar hyperplasia and degenerative joint disease in an age-matched sample (n = 320). Abbreviations defined: hyp = hyperplasia; IVD levels = number of intervertebral disc levels involved; facet levels = number of facet levels involved.

χ hyp

2.5

1.1

1.4

2.75

1.3

1.45

3.35

1.85

1.5

5.15

2.2

2.95

χ nonhyp

2.4

1.2

1.2

2.8

1.45

1.35

3.05

1.55

1.5

4.95

2.15

2.8

t-statistic

0.1738

-0.3121

0.4595

-0.0741

-0.4088

0.2038

0.4204

0.7457

0

-0.3012

-0.1151

-0.3266

p-value

0.863

0.757

0.648

0.941

0.685

0.84

0.677

0.46

1

0.765

0.909

0.746

# of levels

IVD levels

Facet levels

# of levels

IVD levels

Facet levels

# of levels

IVD levels

Facet levels

# of levels

IVD levels

Facet levels

χ hyp*

4.25

1.75

2.5

5.8

2.25

3.55

6.9

2.7

4.2

7.15

2.65

4.5

χ nonhyp

5.9

2.45

3.45

5.45

2.2

3.25

7.7

3.05

4.65

8.15

3.3

4.85

t-statistic

-2.4139

-1.9553

-1.9975

0.4537

0.1111

0.5828

-1.4356

-0.9358

-1.2695

1.9015

1.7786

1.2147

p-value

0.021

0.058

0.053

0.653

0.912

0.563

0.159

0.355

0.212

0.065

0.083

0.232