Variable	Frequency, n (%)
Years lived with chronic low back pain
≥1–5	7 (2)
≥5–10	63 (22)
≥10–20	109 (38)
≥20	111 (38)
Chronic low back pain severity/disability, measured using the Bournemouth Questionnaire,* median (IQR)
Pain severity	7 (5–8)
Interference with daily activities	7 (5–8)
Interference with recreational, social, and family activities	7 (5–8)
Anxiety level	7 (5–8)
Depression level	7 (4–8)
Work-related effect on pain	7 (5–8)
Ability to control pain	5 (4–7)
First experienced low back pain (N = 285)	263 (91)
During military service	263 (91)
After military service	18 (6)
Before military service	4 (1)
Low back pain was treated effectively when first began (N = 285)
No	220 (76)
Unsure	47 (16)
Yes	18 (6)
More treatment options or better access to care may have prevented low back pain from becoming chronic (N = 284)	190 (66)
Yes
Unsure	71 (25)
No	23 (8)

Note: N = 290 unless otherwise indicated.

IQR = interquartile range.

^*Each domain is rated on a scale ranging from 0 (no pain/no disability) to 10 (worst pain possible/complete disability).