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Published online 2014 Apr 2. doi:  10.1186/1745-6215-15-102

Table 1

Eligibility screening

Inclusion criteriaExclusion criteria
Baseline 1
Age 18 to 65 years
LBP with or without leg pain for more than 30 days during the past year
Chiropractic treatment less than 3 months ago
Previous episodes
Completely subsidized treatment from third party payer
Access to a mobile phone
Serious pathology (i.e., acute trauma, cancer, infection, cauda equina, osteoporosis, vertebral fractures) or contraindications to manual therapy
Ability to send and receive SMS (text messages)
Baseline 2
Self-rated “definitely improved” by the fourth treatment
Self-rated improvement being anything but “definitely improved” by the fourth treatment
Study startInterval between treatments is one month or moreInterval between treatments never extends to one month
LBP, Non-specific low back pain