Table 1 Baseline characteristics of health care institutions sorted by types and their location
|  | Before withdrawal N = 129 | After withdrawal N = 205 | p-value | Prescribed group N = 334 | Non-Prescribed group N = 600 | p-value |
|---|---|---|---|---|---|---|
Types | ||||||
 Quaternary | 17 | 26 | 0.0612 | 43 | 0 | 0.0001> |
 Tertiary | 54 | 106 | 160 | 71 | ||
 Secondary | 28 | 23 | 51 | 173 | ||
 Primary | 30 | 50 | 80 | 356 | ||
Location | ||||||
 Seoul | 26 | 36 | 0.6353 | 62 | 102 | 0.2911 |
 Metropolitan excluding Seoul | 25 | 49 | 74 | 137 | ||
 Urban areas | 31 | 41 | 72 | 104 | ||
 Rural areas | 47 | 79 | 126 | 257 | ||