Introduction
Methods
Design
Study population
Baseline characteristics | Low back pain patients (n = 483) |
---|---|
Age [mean (SD)] | 44.4 (14.0) |
Gender [n (%); female] | 250 (51.8) |
Pain [mean (SD); Numerical Rating Scale 0–10] | 6.3 (2.0) |
Prior episode of LBP [n (%); yes] | 351 (72.7) |
Duration current LBP episode [n (%)] | |
0–6 weeks (acute non | 241 (49.9) |
6–12 weeks (sub | 85 (17.6) |
>12 weeks (chronic non-specific LBP) | 151 (31.3) |
Unknown | 6 (1.2) |
Paid job [n (%); yes] | 353 (73.1) |
Sick-leave [n (%)] | |
Yes | 154 (31.9) |
No | 193 (40.0) |
Not applicable | 131 (27.1) |
Unknown | 5 (1.0) |
Outcome measures
EQ-VAS
EQ-5D-3L
Estimating patient valuations
Estimating population valuations
Statistical analyses
Comparing non-specific LBP patient valuations and population valuations.
Relationship between EQ-5D-3L health states and non-specific LBP patient valuations.
Results
EQ-5D-3L health states
Mobility (%) | Self-care (%) | Usual activities (%) | Pain/discomfort (%) | Anxiety/depression (%) | |
---|---|---|---|---|---|
Level 1 | 52.4 | 75.6 | 22.2 | 11.4 | 77.6 |
Level 2 | 47.2 | 24.2 | 69.8 | 79.5 | 21.3 |
Level 3 | 0.4 | 0.1 | 8.0 | 9.1 | 1.1 |
Comparing non-specific LBP patient valuations and population valuations
Patient valuations Mean (SD) | Population valuations Mean (SD) | Mean difference between patient and population valuations Mean (95% CI) | |
---|---|---|---|
All non-specific LBP patients (n = 483) | 0.731 (0.172) | 0.632 (0.167) | 0.098 (0.082 to 0.115) |
Acute non-specific LBP patients (n = 241) | 0.724 (0.164) | 0.608 (0.170) | 0.115 (0.092 to 0.139) |
Sub-acute non-specific LBP patients (n = 85) | 0.718 (0.199) | 0.656 (0.170) | 0.059 (0.020 to 0.097) |
Chronic non-specific LBP patients (n = 151) | 0.748 (0.155) | 0.656 (0.155) | 0.092 (0.064 to 0.120) |
Relationship between EQ-5D-3L health states and non-specific LBP patient valuations
Definitions | Coefficients General population Mean* | Coefficients Non-specific LBP patients Mean (95%CI) * | |
---|---|---|---|
Constant | Subtract if at least one level is at 2 or 3 | 0.173 | 0.146 (0.103 to 0.190) |
Mobility (2) | Subtract if mobility is at level 2 | 0.101 | 0.039 (0.008 to 0.069) |
Mobility (3) | Subtract if mobility is at level 3 | 0.227 | 0.022 (−0.295 to 0.340) |
Self-care (2) | Subtract if self-care is at level 2 | 0.081 | 0.017 (−0.018 to 0.051) |
Self-care (3) | Subtract if self-care is at level 3 | 0.090 | −0.308 (−0.765 to 0.150) |
Usual activities (2) | Subtract if usual activities is at level 2 | 0.040 | 0.038 (0.001 to 0.074) |
Usual activities (3) | Subtract if usual activities is at level 3 | 0.080 | 0.088 (−0.016 to 0.192) |
Pain / discomfort (2) | Subtract if pain/discomfort is at level 2 | 0.065 | 0.038 (−0.006 to 0.083) |
Pain / discomfort (3) | Subtract if pain/discomfort is at level 3 | 0.173 | 0.074 (−0.036 to 0.184) |
Anxiety / depression (2) | Subtract if anxiety/depression is at level 2 | 0.054 | 0.085 (0.051 to 0.119) |
Anxiety / depression (3) | Subtract if anxiety/depression is at level 3 | 0.155 | 0.143 (0.004 to 0.281) |
Any dimension at level 3 | Subtract if any dimension is at level 3 | 0.142 | 0.073 (−0.037 to 0.184) |
R
2
| 0.384 | 0.222 | |
n
| 298 | 483 |