Table 1 Overview of definitions of those variables that were defined differently across three cohorts of chiropractic patients
Sweden | Denmark | UK | |
|---|---|---|---|
Any previous LBP episodes | not available | Yes: ≥1 previous episode ever | Yes: ≥1 previous episode ever |
No | No | ||
≥3 previous LBP episodes | Yes: ≥ 4 episodes previous year | Yes: ≥3 previous episodes ever | not available |
No: < 4 episodes previous year | No: <3 previous episodes ever | ||
LBP days last year | ≤30: 30 days or less in total last year | ≤30: 30 days or less in total last year | ≤30: Max 30 days on and off last year or Max 30 days constant last year |
>30: More than 30 days in total last year, intermittent pain or More than 30 days in total last year, daily pain | >30: More than 30 days in total last year | >30: More than 30 days on and off last year or More than 30 days constant last year | |
Any sick leave due to LBP | Yes: ≥1 day within the last year | Yes: ≥1 day within the last month | Yes: ≥1 day of current sick leave |
No: No sick leave within the last year | No: No sick leave within the last month | No: No current sick leave | |
Leg pain | Yes | Yes: Leg pain intensity last 24 h = 1–10 | Yes: Yes, leg pain above knee or Yes, leg pain below knee |
No | No: Leg pain intensity last 24 h = 0 | No: No leg pain |