Table 1.

Study schedule

	Screening	V1 (day 1)	V2 (after trial)	V3 (3 months ± 30 days)	V4 (6 months ± 30 days)	V5 (12 months ± 60 days)	Time expenditure (min.)
NRS (0–10) (1 item)	x	x	x	x	x	x	6 × 10 60
ODI (10 items)		x		x	x	x	4 × 20 80
SF-36 (36 items)		x		x	x	x	4 × 30 120
ADS-K		x		x	x	x	4 × 30 120
Patient satisfaction with pain relief (0–10) (1 item)		x		x	x	x	4 × 10 40
PSQI (24 items)		x		x	x	x	4 × 20 80
Neurological status (50 items)		x	x	x	x	x	5 × 30 150
IPG-data (15 items)			x	x	x	x	4 × 30 120

NRS Numeric Pain Rating Scale, ODI Oswestry Disability Index, SF-36 The Short Form (36) Health Survey, ADS-K General Depression Scale, PSQI Pittsburgh Sleep Quality Index, IPG implantable pulse generators