Table 3.

Pain and mood parameters and differences between and within persisting SBP and recovering SBP over 1 year

	Visit 1			Visit 4
	Persisting SBP (mean ± SEM)	Recovering SBP (mean ± SEM)	Persisting SBP > recovering SBP (t-score)	Persisting SBP (mean ± SEM)	Recovering SBP (mean ± SEM)	Persisting SBP > recovering SBP (t-score)
VAS (0–100)	57.61 ± 4.12	52.93 ± 4.33	0.78	53.61 ± 6.13	27.77 ± 5.10 ↓	5.94**
MPQ sensory	12.42 ± 1.59	9.66 ± 1.05	1.43	11.50 ± 1.42	5.65 ± 1.37 ↓	2.96**
MPQ affective	3.05 ± 0.61	1.43 ± 0.51	1.44	3.20 ± 0.69	0.89 ± 0.42 ↓	3.43**
MPQ radiulopathy	5.6 ± 0.49	4.30 ± 0.50	1.80	5.30 ± 0.90	3.50 ± 0.73 ↓	2.48*
NPS	47.71 ± 4.25	34.4 ± 3.44	2.55*	42.00 ± 4.78	16.53 ± 2.98 ↓	5.14**
BDI	6.45 ± 1.01	6.55 ± 1.32	−0.05	6.06 ± 1.46	3.54 ± 1.17 ↓	1.25
PANAS positive	33.05 ± 8.05	32.97 ± 1.89	0.03	29.73 ± 6.69	34.42 ± 1.90	−1.9*
PANAS negative	19.4 ± 1.80	16.63 ± 1.44	1.32	20.07 ± 1.54	15.26 ± 2.39 ↓	2.40*
Duration (weeks)	12.4 ± 1.11	12.15 ± 1.08	0.15	65.93 ± 1.22	68.80 ± 1.10	−0.70
Mean pain variance	10.8 ± 3.29	10.8 ± 4.57	0.01	6.2 ± 1.89	1.52 ± 0.49 ↓	2.30*
MQS	1.91 ± 0.60	2.62 ± 0.68	−0.71	3.71 ± 0.99	4.10 ± 0.99	−0.25
MAD	0.53 ± 0.41	0.51 ± 0.58	0.10	0.67 ± 0.53	0.41 ± 0.42	1.7

Clinical pain and mood parameters for persisting SBP (n = 21) and recovering SBP (n = 18) at visit 1 (within weeks from entry into study) and visit 4 (1 year after entry into study). Significant changes between visit 1 and visit 4 (paired t-test, P < 0.01) are displayed as increases (↑), or decreases (↓).

BDI = Beck Depression Index; MAD = mean absolute displacement (motion); MPQ = McGill Pain Questionnaire; MQS = Medication Quantification Scale; NPS = Neuropathic Pain Scale; PANAS = Positive Affect Negative Affect Scale; VAS = Visual Analogue Scale.

*P < 0.05 **P < 0.01, unpaired t-test. Data presented as mean ± SEM.