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Table 2 Descriptive statistics of included patients

From: Co-insurance and health care utilization in Japanese patients with rheumatoid arthritis: a discontinuity regression approach

Characteristics All N (%) Pt. turning 70 before 2014 Pt. turning 70 after 2014 P-value
RA Patients 7343 4905 (67) 2438 (33)  
Age (mean + SD) 69.87 + 0.97 69.96 + 0.96 69.69 + 0.97 < 0.001
Gender
 Female 5874 (80) 3213 (79) 2661 (81) 0.065
Follow-up time (months) (mean + SD) 32.88 + 9.66 33.01 + 9.90 32.63 + 9.15 0.107
Comorbidity
 Pneumonia 2406 (33) 1628 (33) 778 (32) 0.271
 Depression 352 (5) 221 (4) 131 (5) 0.101
 COPD 1455 (20) 928 (19) 527 (21) 0.006
 Liver disease 1263 (17) 823 (17) 440 (18) 0.175
 Diabetes 775 (10) 459 (9) 316 (13) < 0.001
 Renal disease 341 (5) 203 (4) 138 (6) 0.004
CCI score (mean + SD) 2.12 + 1.94 2.00 + 1.84 2.35 + 2.10 < 0.001
  ≤ 2 5044 (69) 3450 (70) 1594 (65)  
 3–5 1893 (26) 1228 (25) 665 (27)  
  > 5 406 (5) 227 (5) 179 (7)  
Health-Care Utilization per person month (mean + SD)  
 Outpatient visit 1.65 + 1.22 1.64 + 1.20 1.67 + 1.25 0.286
 Inpatient visit 0.08 + 0.14 0.08 + 0.14 0.08 + 0.14 0.934
 Length of stay 0.87 + 1.94 0.88 + 2.00 0.85 + 1.81 0.550
 Number of re-hospitalizations 0.02 + 0.07 0.02 + 0.07 0.02 + 0.07 0.200
 Number of emergency visits 0.01 + 0.03 0.01 + 0.03 0.01 + 0.02 0.028
Cost of treatment JYP per person montha (mean + SD)
 Total health care cost 96,785 + 118,209 105,064 + 112,661 92,670 + 115,725 < 0.001
 Out-patient cost 52,048 + 63,517 58,381 + 73,349 48,901 + 57,764 < 0.001
 Hospitalization cost (actual) 44,736 + 95,002 46,683 + 93,367 43,768 + 95,799 0.216
 Hospitalization cost (DPC) 38,869 + 85,578 39,369 + 80,196 38,607 + 88,137 0.710
  1. Pt. patients, SD standard deviation, RA rheumatoid arthritis, COPD chronic obstructive pulmonary disease, JPY Japanese yen, DPC disease procedure combination
  2. a All monetary values were adjusted to 2016 values using the Japan CPI [33]