Please select the eligibility criteria that correspond to the clinical trial below.
Title: Movement System Impairment Based Classification Versus General Exercise for Chronic Non-specific Low Back Pain: a Randomised Controlled Trial
Brief Summary: The objective of this study is to investigate the efficacy of a treatment based on Movement System Impairment based classification (MSI) model in patients with chronic non-specific low back pain.


Options:
A: Inclusion Criteria:

* Subjects of both genders between 18 and 65 years of age with chronic non-specific LBP (pain for more than 3 months) with a pain intensity of at least 3 points measured by a 0-10 points pain numerical rating scale
* Subjects must be able to stand and walk independently
* Subjects must be able to read in Portuguese

Exclusion Criteria:

* Subjects with any contraindication to physical exercise according to the guidelines of the American College of Sports Medicine
* Subjects with severe depression (measured by depression, anxiety and stress scale - DASS)
* Subjects with serious spinal pathologies (fractures, tumors, and inflammatory pathologies such as ankylosing spondylitis), nerve root compromise (disc herniation and spondylolisthesis with neurological compromise, spinal stenosis, and others), serious cardiorespiratory diseases, previous back surgery or pregnancy.
* Subjects that cannot be classified into any of the five categories of the Movement System Impairment model upon initial assessment
B: Inclusion Criteria:

* Active patient in two study primary care clinics or HIV clinic in same system
* Prescribed OAs \>2 mos in the past year
* Back/lower extremity pain
* English or Spanish speaking

Exclusion Criteria:

* Unstable comorbidity
* Cardiovascular/pulmonary disease that prevents exercise
* Cancer-related pain
* Significant mental health disorder
* Alcohol or drug abuse
* Inability to walk unassisted for at least one block
* Inability to provide consent (e.g., dementia)
* Residing more than 10 miles from clinic (poor transportation)
* Patients who are unable or unwilling to attend clinic- or community-based sessions
C: Inclusion Criteria:

* 18-64 years old
* Current non-specific low back pain persisting \>12 weeks. Mean low back pain intensity for the previous week 4 or greater on a 0 to 10 numerical rating scale (0=no pain to 10=worst possible pain).
* English fluency sufficient to follow treatment instructions and answer survey questions
* Willingness to list comprehensive contact information for at least one (preferably two) friend, family member, or work colleague who will always know how to contact the participant.

Exclusion Criteria:

* Use of yoga in the previous 6 months
* New CLBP treatments started within the previous month or anticipated to begin in the next 12 months
* Pregnancy
* Back surgery in the previous three years
* Specific CLBP pathologies
* Severe or progressive neurological deficits
* Sciatica pain equal to or greater than back pain
* Active substance or alcohol abuse
* Active or planned worker's compensation, disability, or personal injury claims
D: Inclusion criteria:

* Group Health Cooperative enrollee
* Uncomplicated low back pain
* At least moderate pain levels

Exclusion criteria:

* Sciatica persisting 3 or more months after physician visit
* History of cancer (other than nonmelanoma skin cancer)
* Severe disk problems
* Unstable medical conditions
* Back surgery within past 3 years
* Physically unable to do the yoga or exercise classes and homework
* Unable to attend classes
* Currently doing yoga
* Taken exercise class for back pain within past year
* Currently in litigation for back pain
* Seeking other treatment for back pain

Answer: A