Table 4.

Empirical reason categories

Reason for Missing DataExplanation/Example
Visual impairmentPatients could not read the test despite visual aids or were blind
Refused consent/lack of motivationPatients were unwilling to participate in CT despite motivation by the study nurse and successful participation in the CORETH survey
Motor conditionPatients were unable to hold the pencil due to the dialysis shunt or paresis
Did not follow instructionPatients wrote noninstruction conform symbols or did not start responding despite consenting to CT
Technical or medical incidentCT had to be interrupted due to alarms of dialysis machine or sudden drop of BP
Language difficultiesPatients were analphabetic or spoke different languages
  • CT, cognitive testing; CORETH, Choice of Renal Replacement Therapy.