TABLE 2.

Means and standard deviations (SD) of outcome measures in the study groups across time

	TEMP (only trial SCS)					PERM (trial and permanent SCS)
	Wave a					Wave
	T1	T2	T3	T4	T5	T1	T2	T3	T4	T5
N	61	34	39	44	29	110	49	82	84	88
Pain severity‐average b
Mean	79.97	78.75	67.82	71.33	69.90	77.17	79.21	44.73	56.67	68.36
SD	13.74	12.58	23.97	17.43	20.89	17.14	17.40	25.87	26.47	22.93
Pain severity‐highest b
Mean	90.76	90.42	80.35	86.75	81.66	88.80	89.39	62.23	70.13	81.18
SD	9.90	9.11	20.20	12.68	23.81	13.04	13.33	28.92	25.73	20.54
Pain severity‐lowest b
Mean	50.87	44.89	46.56	48.78	40.90	50.87	50.52	26.20	35.99	47.46
SD	23.31	19.85	29.29	24.12	26.44	25.11	23.33	24.00	27.24	26.87
Pain rating index c
Mean	33.69	39.13		33.71	35.01	39.91	39.27		37.35	36.88
SD	14.83	15.22		15.93	14.63	17.90	19.37		23.17	19.85
Number of painful regions c
Mean	7.76	7.88		8.16	9.03	8.32	8.48		7.80	7.22
SD	5.86	5.45		4.99	5.21	5.18	6.07		5.25	4.66
Self‐rated health
Mean	2.52	2.57	2.72	2.38	2.66	2.35	2.27	3.05	2.94	2.57
SD	1.16	1.09	1.07	1.09	1.20	1.06	1.16	1.02	1.07	1.06
Health‐related quality of life
Mean	30.15	32.33	32.90	28.59	33.01	27.41	24.94	46.01	40.21	32.46
SD	17.84	20.82	20.53	19.72	20.03	17.91	18.66	22.96	24.20	21.45
Pain interference
Mean	4.16	4.03	4.05	4.06	3.79	4.39	4.44	3.14	3.66	3.99
SD	1.01	0.74	0.89	1.08	1.05	0.77	0.71	1.13	1.05	1.01

^a T1 = at referral to SCS; T2 = between referral and trial SCS; T3 = several days after trial SCS; T4/T5 = ~2/7 months after permanent SCS (or equivalent time for Temp group).

^b Rated for the past 2 weeks on a Visual Analogue Scale (VAS) measured in millimetres.

^c These measures were not included at the third time point.