Figure 1.

The prevalence of 12 different subgroups of LBP in Finnish chiropractic patients. The subgroups are ordered from the most benign to the more severe to add up to 100% (n = 977). Groups: 1 – baseline 1 week, non-persistent, intermittent; 2 – baseline 1 week, non-persistent, daily; 3 – baseline 1 week, persistent, intermittent; 4 – baseline 1 week, persistent, daily; 5 – baseline 2 weeks, non-persistent, intermittent; 6 – baseline 2 weeks, non-persistent, daily; 7 – baseline 2 weeks, persistent, intermittent; 8 – baseline 2 weeks, persistent, daily; 9 – baseline > 2 weeks, non-persistent, intermittent; 10 – baseline > 2 weeks, non-persistent, daily; 11 – baseline > 2 weeks, persistent, intermittent; 12 – baseline > 2 weeks, persistent, daily. • "base-line" refers to the duration of pain at the first visit. • "non-persistent" = altogether < 30 days in the past year. • "persistent" = altogether at least 30 days in the past year. • "intermittent" and "daily" refers to the pain pattern at the first visit.