Observational studies included in the 2009 Chinese guideline for PCI
| Study ID | N | No. of centres | Study period | Follow-up duration | CoR | LoE |
| CHANCE Study Group 200548 | 224 | 23 | May 1997–March 2003 | Mean: 15.6±12.3 months | N/A | N/A |
| Gao 200849 | 444 (220 historical controls) | 1 (controls from 23 centres) | April 2003–February 2006 | Mean: 15 months | N/A | N/A |
| Li 200850 | 1002 | 1 | January 1999–October 2006 | N/R | N/A | N/A |
CHANCE, Chinese Registry of Unprotected Left Main Coronary Artery Stenting; CoR, class of recommendation; LoE, Level of Evidence; N/A, not applicable; N/R, not reported; PCI, percutaneous coronary intervention.