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Table 2 Correlation test of serum SP levels with HHS, VAS and ESR in patients with DDH and DDH&OA

From: Increasing substance P levels in serum and synovial tissues from patients with developmental dysplasia of the hip (DDH)

Correlation of serum substance P levels
Group Sex N With HHS With VAS With ESR
R P R P R P
DDH  
  F 30 −0.344 0.063 0.216 0.251 0.086 0.652
M 10 −0.820 <0.01* 0.591 0.072 0.407 0.243
F + M 40 −0.219 0.175 0.349 0.027 0.156 0.336
DDH&OA  
  F 27 −0.384 0.048 0.355 0.069 0.497 0.083
M 13 −0.694 <0.01* 0.428 0.144 0.437 0.135
  F + M 40 −0.496 <0.01* 0.512 <0.01* 0.508 <0.01*
  1. F female, M male, N number, R correlation coefficient. Spearman correlation test was implemented to investigate the possible correlations in separate groups. A two sides *P < 0.01 means significant correlation.