Garcia 2016.

Methods	Randomised controlled trial
Participants	148 people with a diagnosis of chronic low back pain for at least 3 months.
Interventions	1. Back School group: 4 sessions x 60 minutes for 4 weeks. Participants allocated to this group received theoretical and practical information during the treatment sessions. The first session was conducted individually, and the 3 remaining sessions were conducted in groups. 2. McKenzie Method group: 4 sessions x 60 minutes for 4 weeks. Participants allocated to this group received theoretical information regarding the care of the spine and performed specific exercises according to the direction of preference of movement according to the McKenzie Method.
Outcomes	1. Pain: numerical pain scale. 2. Disability: Roland‐Morris Disability Questionnaire. 3. Adverse events: reported by the physiotherapists on standardised forms.
Notes