| Pain | Beta-2-microglobulin | Total | |
| <50 ng/l | >50 ng/l | ||
| Yes | 4 (36.4%) | 7 (63.6%) | 11 (100%) |
| No | 12 (30.8%) | 27 (69.2%) | 39 (100%) |
| Total | 16 (32%) | 34 (68%) | 50 (100%) |