The following structured assessments were administered: the Confusion Assessment Method (a screening instrument to detect delirium) , the AMT and the (16-question) version of the IQCODE (referred to from here onwards as the 'IQCODE').
We calculated the prevalence of DSM IIIR and other diagnoses of cognitive impairment in the study sample and evaluated the performance of the AMT and IQCODE.
The IQCODE was administered to a carer in 177 (88%) of study subjects.
Sensitivity and specificity values for the detection of patients with DSM IIIR diagnoses of delirium and dementia, using the most discriminating cut-off points of the AMT and IQCODE scores, are shown in Tables 2 and 3.
Sensitivity and specificity values for IQCODE for detection of patients with a DSM IIIR di agnosis of dementia
IQCODE score cut-off point Sensitivity (%) Specificity (%) >3.
The IQCODE was scored by averaging ratings over the 26 items.
Table I shows the number of subjects in each group and the mean IQCODE score, age and years of education.
Characteristics of different IQCODE groups Years of IQCODE Score Age education IQCODE Group n Mean (SD) Mean (SD) Mean (SD) Improvement 34 2.
Mean scores on cognitive tests for different IQCODE groups
Wave 1 Wave 2 IQCODE Group Mean (SD) Mean (SD) change 95% CI Mini-Mental State Examination (MMSE) Improvement 27.