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Table 1 Basic demographic data results for chronic LBP patients receiving screening ZJ blocks

From: Zygapophysial joint blocks in chronic low back pain: a test of Revel's model as a screening test

 

All patients (n = 151)

Excluded patients (n = 35)

Included patients (n = 116)

Significance

Variable

Mean

Median

STD

Mean

Median

STD

Mean

Median

STD

p value

Age (years)

44.3

43.0

13.2

48.03

48.0

14.3

43.2

41.5

12.6

0.09

Duration of current symptoms (weeks)

147.1

91.0

170.2

103.7

74.0

93.5

160.2

104.0

186.2

0.08

Time off work (weeks)

89.5 (n = 69)

74.0

82.4

55.4 (n = 15)

56.0

41.3

99.0 (n = 54)

82.0

88.6

0.04*

VAS (today)

55.9

61.0

24.6

50.8

53.0

27.0

57.4

62.0

23.7

0.24

VAS (at best)

30.3

27.0

22.5

24.6

15.0

22.5

32.0

30.5

22.3

0.06

VAS (at worst)

85.8

89.0

13.3

80.6

87.0

18.4

87.4

90.0

10.9

0.07

Roland Morris Questionnaire

17.8

19.0

4.8

18.0

19.0

4.6

17.7

19.0

4.8

0.68

Zung Depression Index

29.7

29.0

11.6

26.1

26.0

11.8

30.7

30.0

11.4

0.06

MSPQ Questionnaire

9.7

9.0

6.8

8.8

8.0

6.4

9.9

9.0

7.0

0.49

% Male

53.0

  

47.1

  

54.7

  

0.55

% Smoker

34.4

  

35.3

  

34.2

  

0.98

% Off work

50.0

  

44.1

  

51.7

  

0.33

% Previous spinal surgery

28.8

  

17.7

  

28.2

  

0.14

% traumatic onset

69.5

  

73.5

  

68.4

  

0.78

  1. Notes: 1. p value refers to comparisons between included and excluded patients
  2. * significant at p < 0.05