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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]