Table 1.

Demographics, pain and mood parameters for patients with CBP and early SBP

	CBP	Early SBP	CBP > early SBP, t-score (P-value)
Number of subjects	59	94
Age	48.8 ± 1.2	42.1 ± 1.15	3.81 (P < 0.01)
Gender	25 females (42.4%)	48 females (51.1%)	–
Duration	13.5 ± 1.3 years	9.14 ± 0.48 weeks	14.91 (P < 0.01)
VAS	69.58 ± 2.61	58.25 ± 1.95	3.67 (P < 0.01)
MPQ sensory	15.9 ± 0.78	11.2 ± 0.62	4.36 (P < 0.01)
MPQ affective	5.29 ± 0.46	3.04 ± 0.41	3.4 (P < 0.01)
MPQ radiculopathy	4.61 ± 0.31	4.90 ± 0.21	−0.82 (P = 0.41)
BDI	7.30 ± 0.61	6.53 ± 0.61	0.87 (P = 0.38)
NPS	52.81 ± 2.22	40.32 ± 1.81	−3.91 (P < 0.01)

BDI = Beck Depression Index; MPQ = McGill Pain Questionnaire; 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.