Table 1 Baseline Characteristics
From: Back beliefs in patients with low back pain: a primary care cohort study
Variable | Study sample at baseline (n = 2293) | Excluded (n = 77) |
|---|---|---|
Age in years, mean (SD) | 44 (14) | 55 (15) |
Age range in years | 18–87 | 20–80 |
Females | 41% | 52% |
Episodes of LBP before current one, | ||
None | 17% | 19% |
1 episode | 14% | 6% |
2–3 episodes | 24% | 25% |
More than 3 episodes | 45% | 50% |
Missing (n) | 680 | 45 |
Time since start of current episode of LBP, | ||
1–14 days | 60% | 55% |
2–4 weeks | 11% | 18% |
1–12 months | 18% | 17% |
More than a year | 10% | 11% |
Missing (n) | 14 | 4 |
Days with LBP during the previous year | ||
More than 30 days | 37% | 49% |
Missing (n) | 0 | 40 |
Back pain (VAS 0–10), mean (SD) | 6.7 (2.1) | 6.9 |
Back pain divided in quantiles | ||
0–5 | 26% | |
6–7 | 34% | |
8 | 23% | |
9–10 | 17% | |
Disability (RMDQ 0–23), mean (SD) | 12.7 (5.5) | – |
RMDQ score divided into quantiles | ||
0–9 | 29% | |
10–14 | 28% | |
15–17 | 20% | |
18–23 | 23% | |