OA	Osteoarthritis
GHT	group-/home-based hip and knee training
MbT	Machine-based training
WOMAC	Western Ontario and McMaster Universities Osteoarthritis Index
LMM	Linear mixed model
RCT	Randomized controlled trial
MCID	Minimally clinically important difference
BMI	Body mass index
UKT	University Hospital Tuebingen
cfb	Change from baseline
AOK	Allgemeine Ortskrankenkasse (health insurance company)