Medium firm mattress v firm mattress for chronic, non-specific low back pain*
| Outcomes at 90 days | Medium firm mattress | Firm mattress | RBI (95% CI) | NNT (CI) |
|---|---|---|---|---|
| *Abbreviations defined in glossary. RBI, NNT, and CI calculated from control event rates and unadjusted odds ratios in article. Improvement = a positive change in pain intensity between baseline and 90 days. | ||||
| Improvement in pain while lying in bed | 83% | 78% | 6.1% (−6 to 15) | Not significant |
| Improvement in pain on rising | 86% | 80% | 6.8% (−4 to 20) | Not significant |
| Improvement in pain related disability | 82% | 68% | 20% (7 to 30) | 8 (5 to 23) |