Variables | Measurement | Used in analyses as |
---|---|---|
Demographic | Â | Â |
Gender | Male; Female | Categorical |
Age | Date of birth | Continuous: years old at start treatment episode |
Health insurance | Public health insurance (Puhi), private health insurance (Prhi) | Categorical: Puhi; Prhi; Unknown |
Education | Highest level of education: Primary school, secondary education, higher education, university | Categorical: Low (primary); Middle (secondary, higher); High (university); Unknown |
Urbanization rate | 1 very high, 2 high, 3 moderate, 4 low, 5 very low | Categorical: High (3+2+1); Low (5+4); Missing values (1.3%) recoded as high urbanization rate |
Complaints | Â | Â |
Specialization of referring physician | GP or Medical specialist | Categorical: GP; Medical specialist |
Reason for referral | As given by letter by the referrer; coded with ICPC (26) by researchers | Selection of patients with ICPC-code L03.00 |
Duration of complaint at start episode | < 2 days; 2–7 days; 1 week – 1 month; 1–3 months; 3–6 months; 6 months – 1 year; 1–2 years; > 2 years; unknown | Categorical: < 1 month; > 1 month; Missing values (1.0%) recoded as < 1 month |
Recurrent complaint (appearing after a complaint-free episode of at least four weeks and at most two years) | Yes; No; Unknown | Categorical: Yes; No; Missing values (3.7%) recoded as no |
Previous physical therapy for the same or other complaints in the last two years | Yes; No; Unknown | Categorical: Yes; No; Missing values (6.1%) recoded as no |
Treatment | Â | Â |
Treatment goals | Based on the International Classification of Functioning, Disability and Health (27); One main goal (out of 24) at the level of physical functions; One main goal at the level of activities (out of 11) | 5 dichotomous variables; Missing values (0.6%) recoded as changing body position |
Interventions | Based on Dutch classification; three interventions at most (out of 25) applied in at least 50% of the sessions | 5 dichotomous variables; Missing values (16.1%) integrated in reference category |
Therapists | Â | Â |
Gender | Male; Female | Categorical: Male; Female; Missing values (2.1%) recoded as male |
Age | Date of birth | Categorical: <45 years at January 1st, 2003; > 45 years at January 1st, 2003; Missing values (5.1%) recodes as > 45 years |
Hours working per week | Patient-related number of hours | Categorical: <20 hours; 20–40 hours; >40 hours; Missing values (4.1%) recoded as 20–40 hours |
Registration in quality register for manual therapy | Yes; No | Categorical: Yes; No |
Additional training in LBP | Yes; No | Categorical: Yes; No; Missing values (4.1%) recoded as yes |
Additional training in LBP guideline | Yes; No | Categorical: Yes; No; Missing values (4.1%) recoded as no |
Feasibility of LBP guideline | 1 item on questionnaire 10-point scale (1 = very bad; 10 = excellent; 7 = satisfactory) | Categorical: <7 points; >7 points; Unknown |
Time since graduation | Date of graduation | Categorical: < 20 years since graduation; > 20 years since graduation; Missing values (6.2% recodes as > 20 years. |
Practices | Â | Â |
Group size | Number of therapists | Categorical: Single handed; Group practice |