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. 2019 Nov 28;21:255. doi: 10.1186/s13075-019-2053-1

Table 1.

Demographic features of patients on each observation year

Registration 1st year 2nd year 3rd year 4th year
Patients (n) 1127 1127 997 808 588
Age (years)
 Mean ± SD 68.2 ± 10.2 69.2 ± 11.1 70.0 ± 10.2 70.7 ± 9.8 71.0 ± 9.4
 Median, IQR 69, 62–76 70, 63–77 71, 64–77 71, 65–78 71, 65–78
Sex, female (%) 799 (70.9) 799 (70.9) 714 (71.6) 595 (73.6) 441 (75.0)
Disease duration (months)
 Mean ± SD 123.4 ± 115.1 135.5 ± 115.5 147.7 ± 114.5 163.6 ± 114.1 177.3 ± 112.0
 Median, IQR 93, 36–169 105, 48–181 117, 61–193 112, 80–207 147, 97–218
DAS28 score (average, SD) 3.18 ± 1.76 2.88 ± 1.58 2.92 ± 1.57 2.84 ± 1.52 2.83 ± 1.53
Change of prescription 456 (40.5) 360 (36.1) 282 (34.9) 191 (32.5)
Prednisolone
 Number of patients (%) 476 (42.2) 435 (38.6) 352 (35.3) 280 (34.7) 166 (28.2)
 Average dose (mg/day)
  Mean ± SD 4.22 ± 2.54 4.25 ± 2.94 4.21 ± 2.77 4.13 ± 2.92 3.99 ± 2.83
  ≥ 5 mg, number (%) 243 (21.6) 204(18.1) 165 (16.5) 118 (14.6) 68 (11.5)
Biologic DMARDs
 Number of patients (%) 302 (26.7) 314(27.8) 282 (28.2) 244 (30.2) 199 (33.8)
 Etanercept, number (%) 115 (10.2) 119 (10.6) 105 (10.5) 88 (10.9) 77 (13.1)
 Infliximab, number (%) 34 (3.0) 30 (2.7) 24 (2.4) 22 (2.7) 12 (2.0)
 Adalimumab, number (%) 35 (3.1) 28 (2.5) 25 (2.5) 18 (2.2) 14 (2.4)
 Tocilizumab, number (%) 53 (4.7) 61 (5.4) 59 (5.9) 58 (7.2) 51 (8.7)
 Abatacept, number (%) 28 (2.5) 34 (3.0) 40 (4.0) 34 (4.2) 31 (5.3)
 Golimumab, number (%) 33 (2.9) 39 (3.5) 32 (3.2) 26 (3.2) 13 (2.2)
 Others, number (%) 4 (0.4) 3 (0.3) 13 (1.3) 13 (1.6) 9 (1.5)
Methotrexate
 Number of patients (%) 886 (78.6) 835 (74.1) 731 (73.3) 581 (71.9) 414 (70.4)
 Average dose (mg/week), mean ± SD 7.51 ± 3.83 7.49 ± 4.01 7.31 ± 3.96 7.20 ± 3.92 7.00 ± 3.84
Other immunosuppressive drugs
 Number of patients (%) 182 (16.1) 191 (16.9) 168 (16.8) 140 (17.3) 117 (19.8)
 Tacrolimus, number (%) 139 (12.3) 160 (14.2) 137 (13.7) 114 (14.1) 96 (16.3)
 Mizoribine, number (%) 32 (2.8) 32 (2.8) 29 (2.9) 24 (3.0) 19 (3.2)
 Leflunomide, number (%) 6 (0.5) 6 (0.5) 7 (0.7) 6 (0.7) 6 (1.0)
 Others, number (%) 5 (0.5) 3 (0.3) 2 (0.2) 3 (0.4) 3 (0.5)

Abbreviations: SD standard deviation, IQR interquartile range, DAS28 Disease Activity Score 28