Table 2 Patient demographic characteristics and level of evidence of all included studies

Total Patients, No

768,909

Total Patients with FSS, No

378,384

Fibromyalgia, No

198,646

 Studies with fibromyalgia patients, No

13

Chronic Back Pain, No

150,775

 Studies with chronic back pain patients, No

20

Myalgia, No

16,003

 Studies with myalgia patients, No

3

Chronic Migraines or Headaches, No

12,960

 Studies with migraine/headache patients, No

5

Age, mean, year

62.47

Time to Follow-up, mean, mo

17.67

Level of Evidence, No

 I

0

 II

10

 III

18

 IV

0