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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) ----------
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) ----------
VAS for pain at graft site ----------- 13.1 (21.9) (0–96) ----------
VAS for pain at primary surgical site ----------- 25.7(27.5) (0–91) ----------
VAS for pain in extremities ----------- 23.2(27.5) (0–99) ----------
SF-36 Physical Component Score ----------- 40.7(11.5) ----------
SF-36 Mental Component Score ----------- 47.2(13.8) ----------
Oswestry Disability Index ----------- 28.6 (22.4) ----------
  1. † Abbreviations used in this table: M = mean, sd = standard deviation, N = sample size