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Table 1 Absolute frequency of documented raw data sets per study centre over time for the consecutive documentation of cataract surgery in three centres

From: A methodological approach to identify external factors for indicator-based risk adjustment illustrated by a cataract surgery register

  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