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Table 1 Basic characteristics of subjects

From: The effect of common variants in GDF5 gene on the susceptibility to chronic postsurgical pain

Variation Case (n = 1048) Control (n = 2062) P value*
Age (year, mean ± SD) 61.1 ± 7.1 61.1 ± 7.6 0.95
Gender [n, (%)]
 Male 580 (55.3%) 1143 (55.4%) 0.98
 Female 468 (44.7%) 919 (44.6%)
BMI (mean ± SD) 25.97 ± 1.44 26.06 ± 1.56 0.11
PAS (mean ± SD) 2.27 ± 0.98 (0–3) 5.72 ± 1.60 (4–9) < 0.01
Smoking [n, (%)] 250 (23.9%) 514 (24.9%) 0.51
Drinking [n, (%)] 311 (29.8%) 642 (31.1%) 0.40
With prior pain history 118 (11.3%) 220 (10.7%) 0.62
  1. PAS pain analog scale, SD standard deviation
  2. *Pearson χ2 value