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Table 1 In- and exclusion criteria

From: Differences in myoelectric activity of the lumbar muscles between recurrent and chronic low back pain: a cross-sectional study

Group Specific inclusion criteria General inclusion criteria General exclusion criteria
Healthy subjects - no history of LBP of that kind that a doctor or physiotherapist was ever consulted
- fully pain-free at the moment of testing and 24 h before reflected by 0/10 on the NRS scale and 0 on the Rolland Morris disability questionnaire
- males and females
- 18–65 years old
- ≥ 1 years post-natal
- use of antidepressants or analgesics (except for NSAID’s or paracetamol), taken two weeks prior to the testing
- neurological, respiratory, circulatory or severe orthopaedic diseases
- back surgery
- pregnancy
- motor control training for LBP
RLBP - non-specific RLBP in remission
- ≥ 6 months
- a frequency of ≥ 2 episodes in the past year
- a pain flare of ≥ 24 h, characterized by an increase of ≥ 2 on a NRS scale and/or ≥ 5 on the Rolland Morris Disability Questionnaire
- followed by a pain free episode of ≥ 1 month, characterized by a 0/10 on an NRS scale and/or < 2 on the Rolland Morris disability questionnaire
- applicate for medical help concerning low back complaints
Non-continuous CLBP - non-specific CLBP
- ≥ 3 months
- 3 to 4 pain days a week
Continuous CLBP - non-specific CLBP
- ≥ 3 months
- 7 pain days a week