|
Limitation specific to publically-accessible DPC database
|
| 1. The analyzed term is not annual during the initial 6 years. |
| 2. Patient numbers less than 10 are masked. |
|
Limitation specific to DPC database itself
|
| 3. The number of participating hospitals is increasing. |
| 4. Some unreported patients are treated by hospitals not in the DPC database. |
| 5. Double counts of the same patient occurr in different hospitals. |
| 6. The manner of patient coding is partially inconsistent with several revisions. |
| 7. Some aSAH are unreported due to misdiagnosis. |
|
Limitation inherent to methodology
|
| 8. Some patients are treated in a different prefecture. |
| 9. Data from different prefectures is biased to different extents by the above-mentioned limitations. |
