Key term: multilevel model

Original article 2009;35(6):437-445   pdf
Beliefs about back pain predict the recovery rate over 52 consecutive weeks
Elfering A, Mannion AF, Jacobshagen N, Tamcan O, Müller U
 
Original article 2001;27(6):373-380   pdf
A novel approach for evaluating level, frequency and duration of lumbar posture simultaneously during work
Jansen JP, Burdorf A, Steyerberg E