Table 1.

Epidemiological characteristics of study cohorts.

	FMS	SFN	P
No. of patients	158	53	NA
Median age in years [range]	51.5 [21.6–74.8]	53.4 [22.4–73.2]	n.s.
Median age at symptom onset [range]	35.0 [4–65] (n = 158)	47.0 [12–67] (n = 52)	P < 0.001
Median age at diagnosis [range]	45.5 [19.6–67.3]	53.2 [20.4–73.2]	P < 0.001
Median disease duration in years [range]	15.8 [0.0–56.0]	4.0 [0–20.0]	P < 0.001
Median time in years between symptom onset and diagnosis [range]	8.0 [0–46]	2.8 [0–20]	P < 0.001

FMS, fibromyalgia syndrome; NA, not applicable; n.s., not significant; SFN, small fiber neuropathy.