Table 11.

Subgroup comparison for short disease duration of ≤5 years.

	FMS (n = 33)	SFN (n = 32)	P
Median pain intensity during interview (NRS) [range]	5.0 [1–9]	4.0 [1–9]	n.s.
Median pain intensity after medication (NRS) [range]	2.0 [0–4]	1.0 [0–1]	<0.001
Median number of additional symptoms [range]	7.0 [1–28]	4.0 [0–11]	<0.001
Median number of pain aggravating factors [range]	2.0 [1–6]	1.0 [0–3]	<0.01
Median number of pain relieving factors [range]	2.0 [1–4]	1.0 [0–3]	<0.001
Median number of medications [range]	4.0 [1–8]	3.0 [0–10]	n.s.
Median number of nonpharmaceutical therapy attempts [range]	3.0 [0–15]	0.0 [0–4]	<0.001
Psychotherapy in past	7/33 (21.2%)	0/32 (0%)	<0.01
Median IENFD lower leg (fibers/mm) [range]	6.4 [0–14.4]	5.4 [0–11.8]	<0.05
Median IENFD upper thigh (fibers/mm) [range]	8.2 [1.3–16.4]	9.8 [1.5–16.5]	n.s.

FMS, fibromyalgia syndrome; IENFD, intraepidermal nerve fiber density; NRS, numeric rating scale; n.s., not significant; SFN, small fiber neuropathy.