Table 1 Overall participant baseline characteristics and by lumbar spinal stenosis symptom status
All | LSS symptoms | No LSS symptoms | |
|---|---|---|---|
(n = 655) | (n = 185) | (n = 470) | |
Age (years), mean (95% CI) | 58.9 (57.9 to 60.0) | 69.2 (68.3 to 70.1) | 54.9 (53.8 to 56.1) |
Missing, n | 0 | 0 | |
Sex (female), % (95% CI) | 71.8 (68.2 to 75.3) | 70.7 (63.5 to 77.1) | 72.3 (68.0 to 76.3) |
Missing, n | 9 | 1 | 8 |
BMI (kg/m2), mean (95% CI) | 27.8 (27.4 to 28.2) | 28.0 (27.2 to 28.8) | 27.7 (27.2 to 28.2) |
Missing, n | 5 | 0 | 5 |
Education level, % (95% CI) | |||
No qualifying education | 15.4 (12.7 to 18.4) | 15.7 (10.8 to 21.7) | 15.3 (12.2 to 18.9) |
Vocational training | 27.3 (23.9 to 30.9) | 28.6 (22.3 to 35.7) | 26.8 (22.9 to 31.1) |
Higher education (2–4 years) | 40.6 (36.8 to 44.5) | 40.0 (32.9 to 47.4) | 40.9 (36.4 to 45.4) |
Higher education (> 4 years) | 9.8 (7.6 to 12.3) | 8.1 (4.6 to 13.0) | 10.4 (7.8 to 13.5) |
Other | 4.7 (3.2 to 6.7) | 4.9 (2.2 to 9.0) | 4.7 (3.0 to 7.0) |
Missing, n | 14 | 5 | 9 |
STarT Back classification, % (95% CI) | |||
Low | 43.8 (40.0 to 47.7) | 34.1 (27.3 to 41.4) | 47.7 (43.1 to 52.3) |
Medium | 25.3 (22.1 to 28.9) | 31.4 (24.7 to 38.6) | 23.0 (19.2 to 27.1) |
High | 28.1 (24.7 to 31.7) | 31.9 (25.2 to 39.1) | 26.6 (22.7 to 30.8) |
Missing, n | 18 | 5 | 13 |
Episode duration, % (95% CI) | |||
<4 weeks | 7.6 (5.7 to 9.9) | 4.9 (2.2 to 9.0) | 8.7 (6.3 to 11.6) |
4–12 weeks | 11.5 (9.1 to 14.1) | 7.6 (4.1 to 12.4) | 13.0 (10.1 to 16.4) |
3–12 months | 20.8 (17.7 to 24.1) | 18.9 (13.5 to 25.3) | 21.5 (17.9 to 25.5) |
>12 months | 59.5 (55.7 to 63.3) | 68.6 (61.4 to 75.3) | 56.0 (51.3 to 60.5) |
Missing, n | 4 | 0 | 4 |
ODI, mean (95% CI) | 26.0 (25.0 to 26.9) | 30.2 (28.3 to 32.1) | 24.3 (23.1 to 25.4) |
Missing, n | 12 | 3 | 9 |
Back pain, mean (95% CI) | 5.6 (5.4 to 5.8) | 6.0 (5.7 to 6.3) | 5.5 (5.2 to 5.7) |
Missing, n | 2 | 0 | 2 |
Leg pain, mean (95% CI) | 3.3 (3.1 to 3.6) | 4.8 (4.4 to 5.1) | 2.8 (2.5 to 3.0) |
Missing, n | 1 | 1 | 0 |