Table 1

Visit plan of the MISOS trial

	Intake	Surgery	FU 2 weeks	FU 6 weeks	FU 3 months	FU 6 months	FU 12 months	FU 24 months
Inclusion/exclusion criteria	X
Demographics	X
Basic physical examination	X
Neurological examination	X				X
Randomisation		X
X-ray	X				X	X	X	X
MRI	X
VAS low back pain	X		X	X	X	X	X	X
VAS leg pain	X		X	X	X	X	X	X
ODI	X		X	X	X	X	X	X
Patients’ perceived recovery			X	X	X	X	X	X
EQ-5D			X	X	X	X	X	X
Complications		X	X	X	X	X	X	X
Reoperation			X	X	X	X	X	X

EQ-5D, EuroQol, five dimensions; FU, follow-up; MISOS, Minimal Invasive Surgery versus Open Surgery; ODI, Oswestry Disability Index; VAS, Visual Analogue Scale.