Original articleValidity of the revised Impact on Family (IOF) scale
Section snippets
Methods
In 1998 to 2002, during the ISEE study, which was reported in this Journal, Williams et al5 collected baseline data from parents (1998 to 1999), using the 24-item Stein-Riessman IOF scale. These IOF results, however, were not further used or reported, since the 24-item scale failed to produce a scalable construct. A number of items cross-loaded on multiple factors and patterns of intercorrelation were inconsistent. All IOF data were retained after conclusion of the ISEE. Retention of these data
Study Question 1: EFA and CFA
The EFA produced two factors, but the second factor was a poor construct. The first factor had an eigenvalue of 6.8502 and accounted for 45.7% of the variance in the sample. The second factor eigenvalue, however, was barely greater than 1 (1.0473) and accounted for less than 7% to the variance in the sample. In total, the two factors accounted for 52.7% of the variance in the sample.
The varimax rotated factor loadings of the two factors, moreover, were difficult to interpret. Although the
Discussion
Our results generally support the findings of Stein and Jessop4 that the 15 items on their scale measure a single construct. The marginal values of the NFI and RMSEA are of some concern; yet, the model fit appears satisfactory. This is particularly so because the revised IOF is well supported in the IRT analysis and appears to have good construct validity. Additional studies of the revised Impact of Family Scale, however, might lead to further improvements in the instrument. A few items
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2021, Seminars in PerinatologyCitation Excerpt :Time horizons varied from six months to 26 years. Seven studies used the Impact on Family (IOF) scale, a 27-item questionnaire that includes questions related to financial burden.30,31 Interviews and questionnaires with families frequently reported on qualitative measures of financial stress and unexpected costs (Table 6).
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2020, Epilepsy and BehaviorCitation Excerpt :The Impact on Families Scale (IFS) was developed in 1978 and was tested by Stein and Riessman [1] to determine its validity in assessing the familial impact of childhood medical disorders. Numerous studies have been done using the IFS in order to subjectively quantify the footprint of pediatric illnesses on families, providing promising psychometric data for revised versions of the IFS [2–4]. A study done by Camfield et al. [5] depicted the impact of childhood epilepsy on families by validating a similar scale focused on pediatric epilepsy.
The ISEE study was funded in 1998 to 2002 through a grant (RO1 NR947110) awarded to the PI (Phoebe D. Williams, PhD) by the National Institutes of Health, National Institute of Nursing Research, Bethesda, Maryland.