Study Design
LBP
SECONDARY
This study was a secondary analysis of a prospective, multicenter cluster randomized controlled trial investigating the cost-effectiveness of a stratified blended physical therapist intervention compared to usual care in patients with LBP. The detailed study protocol of the parent trial has been published previously.One hundred and twenty-two physical therapists (median 12; interquartile range 19.5 years of experience) from 58 primary care physical therapist practices in the Netherlands participated in the study and recruited patients from July 2018 to December 2019. Practices were cluster-randomized to either the intervention group or usual care group. The patients included in the parent trial were treated as a single cohort of patients with LBP and treatment group allocation was included in the analyses as a baseline characteristic. The study was approved by the Medical Research Ethics Committee of the University Medical Center Utrecht, the Netherlands (ISRCTN 94074203).