Table 2.
Mean Brief Pain Inventory pain interference subscale scores and overall pain at week 6, month 6 and year 1.
| Scale | Intercorrelations (Pearson r) between interference subscales at week 6
|
Week 6 Mean(SD) |
Month 6 Mean(SD) |
Year 1 Mean(SD) |
|||||
|---|---|---|---|---|---|---|---|---|---|
| 1. | 2. | 3. | 4. | 5. | 6. | ||||
| Pain interference total | 2.4(2.6) | 1.6(2.4) | 1.4(2.2) | ||||||
| 1.General activity | 2.8(3.1) | 1.8(2.7) | 1.6(2.6) | ||||||
| 2.Enjoyment of life | 0.76 | 2.3(3.1) | 1.5(2.6) | 1.3(2.5) | |||||
| 3.Mood | 0.76 | 0.78 | 2.9(3.2) | 1.7(2.7) | 1.5(2.5) | ||||
| 4.Normal work | 0.86 | 0.75 | 0.73 | 2.8(3.3) | 1.8(2.9) | 1.6(2.7) | |||
| 5.Relations with other people | 0.62 | 0.74 | 0.73 | 0.64 | 1.6(2.7) | 1.1(2.4) | 0.9(2.1) | ||
| 6.Sleep | 0.71 | 0.68 | 0.68 | 0.68 | 0.60 | 2.9(3.3) | 2.0(3.0) | 1.6(2.8) | |
| 7.Walking ability | 0.67 | 0.64 | 0.60 | 0.68 | 0.57 | 0.55 | 1.5(2.6) | 1.1(2.3) | 1.1(2.3) |
| Cronbach alpha (standardized) | 0.94 | 0.95 | 0.96 | ||||||
| Overall pain intensity | 3.8(2.8) | 3.1(2.8) | 3.2(2.9) | ||||||
| Pearson r* | 0.72 | 0.70 | 0.66 | ||||||
*
Pearson correlation between pain interference summary score and overall pain severity (0–10 NRS).
SD=Standard Deviation.