Table 5. Reported total annualized costs of idiopathic inflammatory myopathies.
| Study (Country of Study) | IIM Subtype(s) | Total Costs Per Patient |
|---|---|---|
| Bradford Rice et al. 2016 (USA) [26] | DM/PM | $17,800±$47,000 |
| Miyazaki et al. 2021 (Japan) [42] | DM/PM (Overall) | $42,800±$82,900 |
| 1 Year Post-Diagnosis | $89,600±$173,100 | |
| 2 Years Post-Diagnosis | $14,400±$49,200 | |
| 3 Years Post-Diagnosis | $10,400±$33,200 | |
| Furst et al. 2012 (USA) [29] | Newly Diagnosed: | |
| DM/PM/Interstitial Myositis | $20,900 | |
| DM | $33,600 | |
| PM | $24,100 | |
| Interstitial Myositis | $12,000 | |
| Existing Diagnosis: | ||
| DM/PM/ Interstitial Myositis | $20,000 | |
| DM | $27,300 | |
| PM | $22,400 | |
| Interstitial Myositis | $11,100 | |
| Leclair et al. 2021* (USA) [9] | DM/PM/IBM | $20,800 |
| 5 Years Pre-diagnosis | $5,900±$14,400 | |
| 4 Years Pre-diagnosis | $6,600±$14,400 | |
| 3 Years Pre-diagnosis | $6,500±$15,000 | |
| 2 Years Pre-diagnosis | $8,400±$16,000 | |
| 1 Year Pre-diagnosis | $23,500±$26,700 | |
| 1 Year Post-diagnosis | $30,300±$31,800 | |
| 2 Years Post-diagnosis | $20,500±$29,300 | |
| 3 Years Post-diagnosis | $17,100±$22,200 | |
| 4 Years Post-diagnosis | $18,100±$25,200 | |
| 5 Years Post-diagnosis | $17,800±$30,900 | |
| Keshishian et al. 2018 (USA) [4] | IBM | $52,800 |
| Capkun et al. 2017 (USA) | IBM | $38,300±$4,100 |
Costs have been converted to 2023 USD with adjustments for purchasing power parity.
* Costs include lost productivity
DM: Dermatomyositis, IBM: Inclusion Body Myositis, IIM: Idiopathic Inflammatory Myositis, PM: Polymyositis