Table 6 Spearman’s rank correlation between serum TNF-α and physical activity, BMI, and symptom duration

Physical Activity^a

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

BMI^b

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 duration^c

rho

0.0335

14

−0.6773

7

p

0.9094

0.0946

n

14

7