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Table 1 Comparison of demographic and clinical characteristics for the baseline and follow-up study samples*†

From: Prospective evaluation of chronic pain associated with posterior autologous iliac crest bone graft harvest and its effect on postoperative outcome

Variable

Baseline sample

(n = 205)

Follow-up sample

(n = 170)

p-value of t-test or chi-square comparing the 2 samples

Age (M, sd)

50.8(12.1)

51.1(12.2)

P = 0.85

Gender (%)

51.2% female (105)

51.8% female (88)

P = 0.92

Time since surgery (sd)

1326.5 days (253.4)

1308.1 days (257.1)

P = 0.49

Procedure (cervical or lumbar)

---------

87.1% lumbar (148)

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Diagnosis

   

% Stenosis (N)

37.2%(67)

38.9% (58)

P = 0.75

% Degenerative Disc Disease (N)

43.3% (78)

39.6% (59)

P = 0.49

Smoking status

24.9% yes (49)

22.8% yes (37)

P = 0.65

Workers compensation status

19.6% yes (40)

17.8% yes (30)

p = 0.65

Pre-op Scores

   

Endorsing chronic pain syndrome (N)

12.9% yes (26)

11.5% yes (19)

P = 0.67

Endorsing regular severe pain from medical condition (N)

20.2% yes (41)

19.1% yes (32)

P = 0.78

Pain tolerance (M, sd)

6.7(2.1)

6.8(2.0)

P = 0.98

Post-op scores

   

ICBG Complications score (sum of yes/no)

-----------

1.2(2.1)

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VAS for pain at graft site

-----------

13.1 (21.9) (0–96)

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VAS for pain at primary surgical site

-----------

25.7(27.5) (0–91)

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VAS for pain in extremities

-----------

23.2(27.5) (0–99)

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SF-36 Physical Component Score

-----------

40.7(11.5)

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SF-36 Mental Component Score

-----------

47.2(13.8)

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Oswestry Disability Index

-----------

28.6 (22.4)

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  1. † Abbreviations used in this table: M = mean, sd = standard deviation, N = sample size