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. 2013 Apr 19;8(4):e61587. doi: 10.1371/journal.pone.0061587

Table 2. Independent variables.

Independent Variables Characteristic/value label
Sociodemographic details Age scale
Gender 1 = female, 2 = male
Diagnosis and Symptoms Subgroup nonspecific, subgroup thoracic, subgroup disc/root irritation, post surgery 1 = yes, 0 = no
Impairment/pain intensity prior to treatment scale
Duration of complaints ≥½ year, radiation into lower extremity, multifocal complaints 1 = yes, 0 = no
Behavioural factors Physically active, smoker, intake of analgesics 1 = yes, 0 = no
Body mass index, scale
Comorbidities Rheumatoid arthritis, mental disorder, neurological-sensory disease, genitourinary or digestive disease, tumours, diabetes 1 = yes, 0 = no
Psychosocial Factors Employed, white collar worker, good self-prognosis on work ability in 2 years 1 = yes, 0 = no
Mental resources scale
Primary therapy Active, passive 1 = yes, 0 = no