Proportion of days covered (PDC) and copay by medication
| HCQ (n=9510) | AZA (n=764) | MMF (n=843) | MTX (n=552) | Combination therapy* (n=1880) | |
| Copayment†, median (Q1, Q3) | 8.3 (4, 10.7) | 7 (2.5, 10) | 10 (5, 20) | 7.8 (2.8, 11) | 8.6 (4, 11.6) |
| PDC, median % (Q1, Q3) | 93 (81, 99) | 92 (81, 98) | 90 (76, 97) | 92 (83, 99) | 93 (85, 97) |
| PDC ≥80%, n (%) | 7287 (76.6) | 583 (76.3) | 586 (69.5) | 447 (81) | 1585 (84.3) |
| Copay ≥$10/month‡, n (%) | 3763 (39.6) | 279 (34.1) | 503 (54.4) | 228 (39.4) | 792 (42.1) |
*Combination therapy: HCQ with another medication (AZA, MMF or MTX).
†Indicates median (Q1, Q3) in dollars per 30 days.
‡Number (and %) of individuals with monthly copayment >$10.
AZA, azathioprine; HCQ, hydroxychloroquine; MMF, mycophenolate mofetil; MTX, methotrexate.