PMID- 10473314
OWN - NLM
STAT- MEDLINE
DCOM- 19991104
LR  - 20220311
IS  - 0033-2917 (Print)
IS  - 0033-2917 (Linking)
VI  - 29
IP  - 4
DP  - 1999 Jul
TI  - The Range of Impaired Functioning Tool (LIFE-RIFT): a brief measure of functional 
      impairment.
PG  - 869-78
AB  - BACKGROUND: The literature documents that functional impairment is associated 
      with affective disorders. Nevertheless, the choice among thorough, yet brief, 
      well-validated assessments of functional impairment is limited. The objective of 
      this study was to evaluate the psychometric properties of a brief scale of 
      functional impairment, the Range of Impaired Functioning Tool (LIFE-RIFT). 
      METHOD: The study sample included subjects who presented with major depressive 
      disorder at intake into the NIMH Collaborative Depression Study (CDS). The 
      LIFE-RIFT is composed of items that are included in the Longitudinal Interval 
      Follow-up Evaluation (LIFE). The reliability and validity were examined using 
      data from LIFE-RIFT assessments conducted at four points in time: 6, 12, 18 and 
      24 months after intake into the CDS. RESULTS: Cross-sectional one factor models 
      accounted for the covariance structure among the four scale items. A longitudinal 
      factor model, with an invariant factor structure over time, also fitted the data 
      well and indicated that the scale items are measures of one construct, namely 
      functional impairment. The internal consistency reliability of the scale was 
      supported with alpha coefficients ranging from 0.81 to 0.83. The inter-rater 
      reliability intraclass correlation coefficient (ICC) was 0.94. Mixed-effect 
      linear regression models showed that those in episode were significantly more 
      impaired than those in recovery. Furthermore, in analyses of predictive validity, 
      impairment was positively associated with subsequent recurrence and negatively 
      associated with subsequent recovery. CONCLUSIONS: This psychometric evaluation 
      provides empirical support for the reliability and validity of the LIFE-RIFT, a 
      brief measure of functional impairment.
FAU - Leon, A C
AU  - Leon AC
AD  - Department of Psychiatry, Cornell University Medical College, College of 
      Physicians and Surgeons of Columbia University and New York State Psychiatric 
      Institute, New York 10021, USA.
FAU - Solomon, D A
AU  - Solomon DA
FAU - Mueller, T I
AU  - Mueller TI
FAU - Turvey, C L
AU  - Turvey CL
FAU - Endicott, J
AU  - Endicott J
FAU - Keller, M B
AU  - Keller MB
LA  - eng
GR  - R01 MH025478/MH/NIMH NIH HHS/United States
PT  - Journal Article
PL  - England
TA  - Psychol Med
JT  - Psychological medicine
JID - 1254142
SB  - IM
MH  - Activities of Daily Living/classification/*psychology
MH  - Adult
MH  - Depressive Disorder, Major/*diagnosis/psychology
MH  - Female
MH  - Follow-Up Studies
MH  - Humans
MH  - Longitudinal Studies
MH  - Male
MH  - Middle Aged
MH  - Personality Assessment/statistics & numerical data
MH  - Psychometrics
EDAT- 1999/09/03 00:00
MHDA- 1999/09/03 00:01
CRDT- 1999/09/03 00:00
PHST- 1999/09/03 00:00 [pubmed]
PHST- 1999/09/03 00:01 [medline]
PHST- 1999/09/03 00:00 [entrez]
AID - 10.1017/s0033291799008570 [doi]
PST - ppublish
SO  - Psychol Med. 1999 Jul;29(4):869-78. doi: 10.1017/s0033291799008570.