Among study participants with a clear graft at @ years , the @ who received a cornea from a donor @ to @ years old experienced a median cell loss of @ % , resulting in a @-year median ECD of @ cells/mm ( @ ) ( interquartile range -LSB- IQR -RSB- , @-@ cells/mm ( @ ) ) , whereas the @ who received a cornea from a donor @ to @ years old experienced a cell loss of @ % , resulting in a median @-year ECD of @ cells/mm ( @ ) ( IQR , @-@ cells/mm ( @ ) ; P adjusted for baseline ECD = @ ) .