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. 2022 Jun 4;22:748. doi: 10.1186/s12913-022-08075-2
Year Calculation for a patient who had an LEA on July, 1, 2013 Calculation for a control without LEA
2010 COCI2010 COCI2010
2011 (COCI2010+ COCI2011)/2 (COCI2010+ COCI2011)/2
2012 (COCI2010 + COCI2011+ COCI2012)/3 (COCI2010 + COCI2011+ COCI2012)/3
2013 (COCI2010+ COCI2011+ COCI2012+ COCI2013 × 0.5)/3.5 (COCI2010+ COCI2011+ COCI2012+ COCI2013)/4