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Table 6 Spearman’s rank correlation between serum TNF-α 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 0.5105 0.3846 0.9000 −0.2242 −0.6000 0.4000
  p 0.0255 19 0.1745 0.0374 0.5334 0.2080 0.6000
  n 19 14 5 10 6 4
BMIb rho −0.1338 −0.1607 −0.1429 0.2545 0.6071 0.2000
  p 0.5632 0.5672 0.7872 0.4500 0.1482 0.8000
  n 19 14 5 10 6 4
Pain: symptom durationc rho   0.0335 14    −0.6773 7  
  p   0.9094    0.0946  
  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