Table 2 Patient reported variables collected at baseline survey via email [23, 45]
Variables | Description | Scale |
|---|---|---|
Sex | Extracted from personal identification number | Female | Male |
Age | Extracted from personal identification number | 18–39 years | 40–59 years | 60 + years [46] |
Pain duration | How long has it been since the current pain began? | 0–2 weeks | 2–4 weeks | 4–12 weeks | 3–12 months | More than 1 year |
Previous episodes of LBP | Before this episode of LBP, how many episodes of LBP have you been treated for in the last 2 years? | No | 1 episode | 2–3 episodes | More than 3 episodes |
Back pain | Pain intensity within the last week in Numeric Rating Scale (NRS). | 0 = No pain to 10 = Worst imaginable |
Disability | Current activity limitation on Oswestry Disability Index (ODI). | 0–100; higher scores reflect more disability |