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Table 7 Spearman’s rank correlation between serum PDGF-BB and physical activity, BMI, and symptom duration

From: A pilot study on biomarkers for tendinopathy: lower levels of serum TNF-α and other cytokines in females but not males with Achilles tendinopathy

   Achilles tendon status (grouped by gender)
   Total M AT M Control M Total F AT F Control F
Physical Activitya rho −0.1895 −0.5868 0.7000 −0.0545 −0.4857 1.0000
  p 0.4372 0.0274 0.1881 0.8810 0.3287 0.0000
  n 19 14 5 10 6 4
BMIb rho −0.0831 −0.0536 −0.1429 0.2455 0.3214 0.0000
  p 0.7202 0.8496 0.7872 0.4669 0.4821 1.000
  n 21 15 6 11 7 4
Pain: symptom durationc rho   0.2995    −0.4383  
  p   0.2982    0.3253  
  n   14    7  
  1. aMeasured in MET-hours/week, bmeasured in kg/m2, cmeasured in months
  2. Note: M male, F female, AT Achilles tendinopathy
  3. Physical activity score was missing for 2 men and 1 woman, symptom duration was missing for 1 man with tendinopathy