Design of the Verbiest trial: cost-effectiveness of surgery versus prolonged conservative treatment in patients with lumbar stenosis

Table 2 Study measurements over time.

Time in weeks	-2	0	4	12	26	38	52	104	156	208	260
Inpatient visit: surgery			x
Outpatient visit	x	x		x	x		x	x			x
Questionnaire		x	x	x	x	x	x	x	x	x	x
Patient demographics	x
MMSE	x
Basic physical examination	x
Neurological examination	x			x	x		x	x			x
X-ray	x		x
MRI	x
ZCQ		x	x	x	x	x	x	x	x	x	x
Shuttle Walking Test		x			x		x	x			x
Accelerometry		x			x		x	x			x
SPPB		x		x	x		x	x			x
RMDQ		x	x	x	x	x	x	x	x	x	x
SF-36		x	x	x	x	x	x	x	x	x	x
Perceived Recovery			x	x	x	x	x	x	x	x	x
VAS for legs and back		x	x	x	x	x	x	x	x	x	x
EuroQol-5D		x	x	x	x	x	x	x	x	x	x
Patient diary				x	x		x	x	x	x	x
Complications			x	x	x		x	x			x
Re-operation			x	x	x		x	x			x

MMSE: mini-mental state examination; ZCQ: Zurich claudication questionnaire; SPPB: short physical performance battery; RMDQ: Roland Morris disability questionnaire; SF-36: short form 36; VAS: visual analogue scale.

ISSN: 1471-2474