. Author manuscript; available in PMC: 2016 Nov 1.

Published in final edited form as: Reg Anesth Pain Med. 2015 Nov-Dec;40(6):687–693. doi: 10.1097/AAP.0000000000000315

Table 1. Baseline descriptive data.

	Healthy Controls	Patients	P-value
	N = 20	N = 20	P-value
Demographics

Age	29.2 (13.2)	44.5 (9.2)	< 0.001
Sex (% Male)	50%	35%	0.337
Race (% Caucasian)	61%	95%	0.022

Pain Phenotype

Pain Severity (BPI)	0.1 (0.2)	6.2 (1.3)	< 0.001
Neuropathic pain (PainDETECT)	0.3 (1.0)	19.7 (7.4)	< 0.001
Fibromyalgia Survey Score	1.1 (1.2)	14.2 (7.6)	< 0.001
Catastrophizing	1.5 (2.7)	17.8 (8.4)	< 0.001
Depressive symptoms (HADS)	0.9 (1.1)	9.2 (3.8)	< 0.001
Anxiety symptoms (HADS)	1.5 (1.7)	9.4 (3.7)	< 0.001
Fatigue (PROMIS)	10.1 (1.0)	24.3 (5.2)	< 0.001
Sleep (PROMIS)	12.3 (3.0)	33.3 (5.7)	< 0.001

The patient group was significantly older and had a higher percentage of Caucasians. As expected, the patient group also reported a significantly worse pain phenotype.

Note: Means and standard deviations are presented for continuous variables, and percentages are presented for dichotomous variables. Mean differences assessed using t-test, and percent differences were assessed using the chi-square test.

BPI = Brief Pain Inventory; HADS = Hospital Anxiety and Depression Scale; PROMIS = Patient Reported Outcomes Measurement Information System.