Table 1 Absolute frequency of documented raw data sets per study centre over time for the consecutive documentation of cataract surgery in three centres
2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | total | |
|---|---|---|---|---|---|---|---|---|
Centre 1 | 55 | 1,445 | 906 | 1,122 | 681 | 428 | 171 | 4,808 |
Centre 2 | 771 | 572 | 1,038 | 137 | 2,518 | |||
Centre 3 | 1,309 | 1,484 | 1,222 | 1,191 | 1,413 | 979 | 7,598 | |
Total | 55 | 2,754 | 3,161 | 2,916 | 2,910 | 1,978 | 1,150 | 14,924 |