Table 4.
The average unit OOPs (per outpatient visit and inpatient day) and the ratios of each group (I, II, III, IV) to the richest group (V) during 2007–2009.
| Service Category | Outpatient | |||||
|---|---|---|---|---|---|---|
| Income Group | No. | Mean | SD | Median | Ratio | 95% CI |
| V | 728 | 7.74 | 8.94 | 3.96 | 1.00 | |
| IV | 679 | 6.90 | 8.17 | 3.66 | 0.89 | 0.79–1.00 |
| III | 755 | 6.43 | 7.25 | 3.76 | 0.93 | 0.82–1.05 |
| II | 803 | 5.63 | 6.80 | 3.41 | 0.83 | 0.74–0.94 |
| I | 990 | 4.73 | 6.57 | 2.03 | 0.75 | 0.66–0.85 |
| Total | 3955 | 6.16 | 7.58 | 3.49 | ||
| Service category | Inpatient | |||||
| Income Group | No. | Mean | SD | Median | Ratio | 95% CI |
| V | 270 | 193.52 | 317.55 | 126.67 | 1.00 | |
| IV | 279 | 178.78 | 255.15 | 123.33 | 1.00 | 0.85–1.19 |
| III | 243 | 158.12 | 186.51 | 101.16 | 0.87 | 0.73–1.04 |
| II | 251 | 147.75 | 188.82 | 97.43 | 0.91 | 0.76–1.08 |
| I | 294 | 181.57 | 460.79 | 76.67 | 0.59 | 0.51–0.68 |
| Total | 1337 | 172.79 | 306.53 | 101.25 | ||
Notes: Mean, SD, Median: thousand won, 1 U$ = 1100 thousand won; Ratio: ratios of the geometric mean of each group (II,III,IV,V) compared with the poorest group (I), adjusted for sex, age, Medicaid Aid recipient, private health insurance, residential area and self-reported health status, using Analysis of covariance (ANCOVA) with logarithmic transformation of the average unit (per clinical visit, per inpatient day) cost.