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The psychometric validation of the OAB family impact measure (OAB‐FIM)
Author(s) -
Coyne Karin S.,
Matza Louis S.,
BrewsterJordan Jessica,
Thompson Christine,
Bavendam Tamara
Publication year - 2010
Publication title -
neurourology and urodynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 90
eISSN - 1520-6777
pISSN - 0733-2467
DOI - 10.1002/nau.20715
Subject(s) - overactive bladder , medicine , exploratory factor analysis , cronbach's alpha , quality of life (healthcare) , physical therapy , clinical psychology , psychometrics , nursing , alternative medicine , pathology
Aims Although overactive bladder (OAB) impacts patient health‐related quality of life, the impact of OAB on family members is not known. Presently, no validated instruments exist to assess family impact, thus we examined the psychometric properties of a new instrument, the overactive bladder family impact measure (OAB‐FIM). Methods Dyads of OAB patient–family members and control patient–family members were recruited from clinics. Family members (spouses, significant others, or daughters) completed the 32‐item draft OAB‐FIM. Patients completed the overactive bladder questionnaire (OAB‐q) and the patient perception of bladder condition (PPBC). Both patients and family members completed two validated relationship measures. Item and exploratory factor analyses were performed to determine subscale structure; reliability and validity were assessed. Results One hundred ninety‐three patient–family member dyads (163 OAB, 30 control) participated. OAB patients were mostly women (82%); the control group was younger with fewer women (53%). Family members were predominantly men (OAB, 58%; control, 52%), and control family members were younger than OAB family members. Thirteen items were deleted from the draft OAB‐FIM based on item performance and factor structure based on exploratory factor analyses, leaving 19‐items in the final OAB‐FIM. Four subscales (Irritation, Activities, Travel, Concern) were derived for use among all family members; two additional subscales (Sleep, Sex) were derived for use with spouses/significant others. The OAB‐FIM discriminated between OAB and control family members with OAB family members demonstrating significant impact (all P < 0.0001). Internal consistency reliability (Cronbach's alpha >0.70) and 2‐week test–retest reliability (intraclass correlation coefficients >0.73) were high for all subscales. Concurrent validity of the OAB‐FIM was demonstrated through statistically significant ( P < 0.001) Spearman correlations with the OAB‐q (0.35–0.58) and the PPBC (0.31–0.56). The OAB‐FIM also demonstrated known‐groups validity, distinguishing between family members of OAB patients and family members of control patients. Conclusions This study supports the reliability and validity of a new measure to assess the impact of OAB on family members and demonstrates that family members are affected by another's medical condition. Neurourol. Urodynam. 29:359–369, 2010. © 2009 Wiley‐Liss, Inc.