Table 1. The accumulated and average impact factors of articles published in nephrology and urology journals by researchers from the Mainland (ML), Hong Kong (HK), and Taiwan (TW) from 1999 to 2008.
| Year | Accumulated impact factor | Average impact factor | ||||
| ML | HK | TW | ML | HK | TW | |
| 1999 | 37.0 | 112.4 | 177.8 | 2.2 | 3.4 | 3.0 |
| 2000 | 60.0 | 101.7 | 220.6 | 2.1 | 3.2 | 2.9 |
| 2001 | 77.9 | 161.1 | 341.8 | 2.0 | 3.7 | 2.9 |
| 2002 | 60.3 | 116.9 | 266.4 | 2.1 | 3.6 | 2.6 |
| 2003 | 110.5 | 163.6 | 305.4 | 2.5 | 3.5 | 2.3 |
| 2004 | 137.3 | 149.9 | 346.6 | 2.4 | 3.1 | 2.5 |
| 2005 | 236.7 | 175.6 | 332.8 | 2.5 | 2.8 | 2.6 |
| 2006 | 401.5 | 222.7 | 455.5 | 2.5 | 3.1 | 2.6 |
| 2007 | 459.7 | 213.0 | 566.9 | 2.4 | 2.6 | 2.7 |
| 2008 | 691.9 | 172.3 | 606.8 | 2.3 | 2.8 | 2.6 |
| Total | 2272.9 | 1589.2 | 3620.7 | 2.3 | 3.2 | 2.7 |