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Results of the logistic regression analysis |
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| Descriptor |
Variable |
Odds ratio (95% CI) |
P value |
Likelihood ratio test |
P of the test |
|
|
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| SLR |
Intensity of leg pain |
1.3 (1.2–1.4) |
0.000 |
55.2 |
0.000 |
| X-rays |
Intensity of leg pain |
1.2 (1.0–1.2) |
0.017 |
76.4 |
0.000 |
| >2 episodes of low back pain |
1.9 (1.4–2.7) |
0.000 |
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| Disability |
1.1 (1.0–1.1) |
0.002 |
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| Chronicity* |
0.000 |
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| Subacute |
2.3 (1.5–3.5) |
0.000 |
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| Chronic |
2.7 (1.2–6.1) |
0.022 |
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| SLR |
0.002 |
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| > 60° |
0.7 (0.4–1.0) |
0.038 |
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| < 60° |
1.5 (1.0–2.2) |
0.085 |
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| CT scan or MRI |
Sex (male)* |
1.9 (1.3–3.0) |
0.003 |
93.4 |
0.000 |
| Intensity of leg pain |
1.1 (1.1–1.2) |
0.001 |
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| Disability |
1.1 (1.0–1.1) |
0.000 |
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| Chronicity* |
0.000 |
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| Subacute |
2.7 (1.6–4.5) |
0.000 |
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| Chronic |
5.8 (2.5–13.6) |
0.000 |
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| SLR |
0.002 |
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| > 60° |
0.7 (0.4–1.3) |
0.230 |
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| < 60° |
1.9 (1.1–3.3) |
0.016 |
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| Prescription of medication |
Chronicity* |
0.022 |
18.4 |
0.001 |
|
| Subacute |
1.5 (0.6–3.4) |
0.370 |
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| Chronic |
0.3 (0.1–0.8) |
0.013 |
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| SLR |
0.003 |
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| > 60° |
0.5 (0.3–1.0) |
0.059 |
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| < 60° |
2.2 (0.9–5.1) |
0.073 |
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| Referral to rehabilitation or physical therapy |
Intensity of low back pain |
1.1 (1.0–1.2) |
0.015 |
29.5 |
0.000 |
| >3 episodes of low back pain |
1.5 (1.0–2.3) |
0.039 |
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| Chronicity* |
0.006 |
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| Subacute |
2.1 (1.3–3.4) |
0.002 |
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| Chronic |
1.9 (0.8–4.7) |
0.172 |
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| SLR |
0.018 |
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| > 60° |
0.6 (0.4–1.1) |
0.092 |
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| < 60° |
1.4 (0.9–2.2) |
0.184 |
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| Referral to surgery (orthopedic surgery or neurosurgery) |
Sex (male) |
2.0 (1.1–3.5) |
0.023 |
61.6 |
0.000 |
| Intensity of leg pain |
1.2 (1.1–1.3) |
0.002 |
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| Disability |
1.1 (1.0–1.2) |
0.001 |
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| Chronicity* |
0.000 |
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| Subacute |
3.5 (1.8–6.7) |
0.000 |
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| Chronic |
9.9 (4.0–24.4) |
0.000 |
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| Sick leave* |
Roland-Morris |
1.2 (1.1–1.2) |
0.000 |
58.7 |
0.000 |
| Intensity of leg pain |
1.1 (1.0–1.2) |
0.024 |
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| Employed by others |
2.0 (1.1–3.9) |
0.031 |
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|
*The variables chronicity and SLR are coded as "dummy variables", using the categories "acute" and "not done", respectively, as reference. For "sex", the reference is the "female" category. Since sick leave was only possible in workers, the models on sick leave only included the 367 workers in the study. For continuous variables, the table shows the OR of each one point increase in the corresponding scale. For dichotomous variables, the table shows the OR for each category | |||||
Kovacs et al. BMC Health Services Research 2006 6:57 doi:10.1186/1472-6963-6-57 |
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