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Table 1 Criteria for eligibility

From: Do psychological and behavioral factors classified by the West Haven-Yale Multidimensional Pain Inventory (Swedish version) predict the early clinical course of low back pain in patients receiving chiropractic care?

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.
Chiropractic treatment less than 3 months ago.
Treatment paid by third-party.