Characteristics of the study sample
| Variables | N | |
| All patients | 292 | (100%) |
| Age, median (range) | 62.5 (30.9–87.5) | |
| Sex | ||
| Female | 119 | (40.8%) |
| Male | 173 | (59.2%) |
| Stage of MM | ||
| New diagnosis of MM | 98 | (33.6%) |
| Treated MM | 106 | (36.3%) |
| Premalignant stage (MGUS; SMM) | 88 | (30.1%) |
| Comorbidity | ||
| Charlson Comorbidity Index ≤2 | 224 | (76.7%) |
| Charlson Comorbidity Index >2 | 68 | (23.3%) |
| Health-related quality of life | ||
| PCS, median (range) | 286 | 37.5 (16.4–59.6) |
| MCS, median (range) | 286 | 43.2 (11.5–68.9) |
| Depression severity (PHQ-9 sum score) | ||
| None (0–4) | 123 | (45.2%) |
| Mild (4–9) | 92 | (33.8%) |
| Medium (10–14) | 34 | (12.5%) |
| Severe (15–27) | 23 | (8.5%) |
MM, multiple myeloma; MGUS, monoclonal gammopathy of undetermined significance; PCS, Physical Component Score; PHQ-9, Patient Health Questionnaire-9; SMM, smouldering multiple myeloma.