Table 1 Criteria for eligibility

Inclusion criteria

Low back pain with or without leg pain.

18–65 years of age.

Episodes of low back pain previous year.

Pain >30 days previous year.

Access to mobile phone.

Able to send SMS.

Exclusion criteria

Specific spinal or systemic pathology needing treatment elsewhere.

Pregnancy.

Chiropractic treatment less than 3 months ago.

Treatment paid by third-party.