Table 1 Basic patient demographics
| Â | Total | Geri-OPD | Non-Geri-OPD | P |
|---|---|---|---|---|
Number, n (%) | 6723 (100) | 1291 (19.2) | 5432 (80.8) | Â |
Sex | ||||
 Female, n (%) | 3796 (56.46) | 737 (57.1) | 3059 (56.3) | 0.61 |
 Male, n (%) | 2927 (43.53) | 554 (42.9) | 2373 (43.7) |  |
Age, mean ± standard deviation (SD) | 80.42 ± 6.39 | 80.90 ± 6.42 | 80.71 ± 6.38 | 0.33 |
 65–80 years, n (%) | 3095 (46.04) | 579 (44.8) | 2516 (46.3) | 0.34 |
  ≥ 80 years, n (%) | 3628 (53.96) | 712 (55.2) | 2916 (53.7) |  |
Charlson comorbidity index (CCI) |  |  |  | < 0.01 |
 CCI = 0, n (%) | 2993 (44.5) | 462 (35.8) | 2531 (46.6) |  |
 CCI = 1, n (%) | 1404 (20.9) | 300 (23.2) | 1104 (20.3) |  |
 CCI ≥ 2, n (%) | 2326 (34.6) | 529 (41) | 1797 (33.1) |  |
Medical problems, n (%) | ||||
 Acute myocardial infarction | 228 (3.4) | 42 (3.3) | 186 (3.4) | 0.76 |
 Congestive heart failure | 442 (6.6) | 111 (8.6) | 331 (6.1) | < 0.01 |
 Peripheral vascular disease | 111 (1.7) | 31 (2.4) | 80 (1.5) | 0.02 |
 Cerebral vascular accident | 1353 (20.1) | 261 (20.2) | 1092 (20.1) | 0.93 |
 Dementia | 747 (11.1) | 154 (11.9) | 593 (10.9) | 0.30 |
 Pulmonary disease | 725 (10.8) | 264 (20.4) | 461 (8.5) | < 0.01 |
 Connective tissue disorder | 45 (0.7) | 12 (0.9) | 33 (0.6) | 0.20 |
 Peptic ulcer | 784 (11.7) | 191 (14.8) | 593 (10.9) | 0.00 |
 Liver disease | 175 (2.6) | 40 (3.1) | 135 (2.5) | 0.21 |
 Diabetes mellitus | 1288 (19.2) | 318 (24.6) | 970 (17.9) | < 0.01 |
 Diabetes mellitus complications | 595 (8.9) | 135 (10.5) | 460 (8.5) | 0.02 |
 Renal disease | 741 (11.0) | 157 (12.2) | 584 (10.8) | 0.15 |
 Depression | 304 (4.5) | 77 (6) | 227 (4.2) | 0.01 |
Annual outpatient department visits (mean ± SD) |  | 66.40 ± 51.45 | 35.86 ± 48.53 | < 0.01 |
Annual emergency room visits (mean ± SD) |  | 2.36 ± 6.86 | 0.968 ± 3.27 | < 0.01 |
Number of drugs (mean ± SD) |  | 23.22 ± 5.6 | 16.34 ± 12.43 | < 0.01 |
Annual hospitalizations (mean ± SD) |  | 0.57 ± 1.05 | 0.23 ± 0.69 | < 0.01 |
Length of hospital stay (days/year) |  | 6.94 ± 16.88 | 2.48 ± 9.19 | < 0.01 |
Cost of each clinic visit (log, mean ± SD, NTD) |  | 7.41 ± 1.07 | 5.05 ± 3.44 | < 0.01 |
Cost of each hospitalization (log, mean ± SD, NTD) |  | 3.58 ± 5.11 | 1.66 ± 3.92 | < 0.01 |
Cost of annual outpatient care (log, mean ± SD, NTD) |  | 507.7 ± 408.0 | 269.1 ± 403.2 | < 0.01 |
Cost of annual hospitalizations (log, mean ± SD, NTD) |  | 6.15 ± 11.39 | 2.52 ± 7.46 | < 0.01 |