Table 2.

Pain characteristics by study

		Study 1 (n=959)		Study 2 (n=207)
Pain Location		n	%	n	%
	Head	392	40.9	7	3.4
	Extremities	168	17.5	20	9.7
	Back	126	13.1	61	29.5
	Abdominal	126	13.1	47	22.7
	Joint	14	1.5	36	17.4
	Generalized	26	2.7	22	10.6
	Other	54	5.7	7	3.5
Pain Duration
	2–3 months	102	10.6	23	11.1
	3–6 months	180	18.8	27	13.0
	7–11 months	102	10.6	29	14
	1–3 years	346	36.1	65	31.4
	More than 3 years	203	21.2	42	20.3

Note. For Study 2, generalized pain was diagnosed as fibromyalgia; For Study 2, other pain included chest wall (n=4), pelvic (n=2), shoulder only (n=1); For Study 1, other pain locations included chest (26), jaw (n=2), and missing (n=38); In Study 1, pain duration was not reported for 26 individuals; In Study 2, pain duration was not reported for 21 individuals. There was significantly greater head pain (chi-squared = 106.24, p<0.0001), extremity pain (chi-squared = 7.66, p < 0.01), and back pain (chi-squared =34.02, p<0.0001) in Study 1. There was significantly greater abdominal pain (chi-squared = 12.43, p<0.001), joint pain (chi-squared = 103.99, p < 0.0001), and generalized pain (chi-squared = 26.99, p< 0.0001) in Study 2. There were more participants with a 3–6 month pain duration in Study 1 (chi-square = 3.92, p < 0.05).