Table 2.

Comparison of fibromyalgia characteristics based on diagnostic criteria used

	Clinical fibromyalgia diagnosis		Self-report questionnaire fibromyalgia (FS ≥13 plus chronic pain)
	Fibromyalgia n=144	Not fibromyalgia N=193	Fibromyalgia N=145	Not fibromyalgia N=192
Fibromyalgia score (range 0–31)	17.2 (5.9)	9.0 (4.5)	18.7 (4.5)	7.9 (3.1)
	17	9	18	8
	53 (36.8)	6 (3.1)	58 (40.0)	1 (0.5)
Mean (SD)
Median, N
>19, N (%)
Tender point count, mean (SD)	14.6 (3.8)	3.1 (3.1)	12.7 (5.6)	4.5 (5.0)
Tender point score, mean (SD)	91.3 (38.4)	15.3 (16.6)	79.6 (47.2)	23.8 (29.2)
Met ACR 1990 criteria* (%)	111 (77.1)	2 (1.0)	94 (64.8)	19 (9.9)

^*Pain at least 3 months, widespread pain present, and tender point count ≥11