title: Validation of the dementia care assessment packet-instrumental activities of daily living.
abstract: OBJECTIVE
  We aimed to evaluate the psychometric properties of the IADL measure included in the Dementia Care Assessment Packet (DCAP-IADL) in dementia patients.
  
  
  METHODS
  The study involved 112 dementia patients and 546 controls. The DCAP-IADL was scored in two ways: observed score (OS) and predicted score (PS). The reliability of the DCAP-IADL was evaluated by testing its internal consistency, inter-rater reliability and test-retest reliability. Discriminant validity was evaluated by comparing the mean OS and PS between dementia patients and controls by ANCOVA. Pearson or Spearman correlation analysis was performed with other instruments to assess concurrent validity. Receiver operating characteristics curve analysis was performed to examine diagnostic accuracy.
  
  
  RESULTS
  Chronbach's α coefficients of the DCAP-IADL were above 0.7. The values in dementia patients were much higher (OS=0.917, PS=0.927), indicating excellent degrees of internal consistency. Inter-rater reliabilities and test-retest reliabilities were statistically significant (p<0.05). PS exhibited higher reliabilities than OS. The mean OS and PS of dementia patients were significantly higher than those of the non-demented group after controlling for age, sex and education level. The DCAP-IADL was significantly correlated with other IADL instruments and MMSE-KC (p<0.001). Areas under the curves of the DCAP-IADL were above 0.9.
  
  
  CONCLUSIONS
  The DCAP-IADL is a reliable and valid instrument for evaluating instrumental ability of daily living for the elderly, and may also be useful for screening dementia. Moreover, administering PS may enable the DCAP-IADL to overcome the differences in gender, culture and life style that hinders accurate evaluation of the elderly in previous IADL instruments.
authors.affiliation: Department of Psychiatry, Dankook University Hospital, Cheonan, Republic of Korea.
authors.forename: Seok Bum
authors.initials: SB
authors.lastname: Lee
authors.forename: Jeong Ran
authors.initials: JR
authors.lastname: Park
authors.forename: Jeong-Hwa
authors.initials: JH
authors.lastname: Yoo
authors.forename: Joon Hyuk
authors.initials: JH
authors.lastname: Park
authors.forename: Jung Jae
authors.initials: JJ
authors.lastname: Lee
authors.forename: Jong Chul
authors.initials: JC
authors.lastname: Yoon
authors.forename: Jin Hyeong
authors.initials: JH
authors.lastname: Jhoo
authors.forename: Dong Young
authors.initials: DY
authors.lastname: Lee
authors.forename: Jong Inn
authors.initials: JI
authors.lastname: Woo
authors.forename: Ji Won
authors.initials: JW
authors.lastname: Han
authors.forename: Yoonseok
authors.initials: Y
authors.lastname: Huh
authors.forename: Tae Hui
authors.initials: TH
authors.lastname: Kim
authors.forename: Ki Woong
authors.initials: KW
authors.lastname: Kim
keywords: DCAP; Dementia; Instrumental activities of daily living