Original articleTest for item bias in a quality of life questionnaire
References (25)
- et al.
Age and the operationalization of social support
Soc Sci Med
(1991) - et al.
- Bjorner JB, Groenvold M, Kreiner S. Item bias in medical indexes—concepts, techniques, and implications. J Clin...
Validation of index scales for analysis of survey data: the Symptom Index
- et al.
- et al.
The measurement of Instrumental ADL: Content validity and construct validity
Aging Clin Exp Res
(1993)
DBCG-89. Program for behandling og kontrol af patienter med primær, operabel cancer mammae (DBCG-89. Program for treatment and follow-up of patients with primary, operable breast cancer)
Systemic treatment of early breast cancer by hormonal, cytotoxic, or immune therapy. 133 randomised trials involving 31,000 recurrences and 24,000 deaths among 75,000 women
Lancet
Systemic treatment of early breast cancer by hormonal, cytotoxic, or immune therapy. 133 randomised trials involving 31,000 recurrences and 24,000 deaths among 75,000 women
Lancet
Cited by (57)
The calibrated, unidimensional anxiety item bank for cardiovascular patients provided the basis for anxiety assessment in cardiovascular rehabilitation patients
2013, Journal of Clinical EpidemiologyCitation Excerpt :It occurs when subgroups (e.g., women and men) answer differently to an item, although they have an identical underlying level of anxiety [42,48]. The analyses of DIF were calculated for four sociodemographic variables (gender, age, educational level, and employment status) and three disease-specific variables (intensity of pain, subjective limitations because of CVD, and specific cardiovascular diagnoses), which have been shown to be significant confounders of the association between anxiety and somatic diseases [49–52]. The existence of DIF was calculated by an analysis of variance of the person–item deviation residuals with person factors and class intervals as factors [42,47].
Development of a PROMIS item bank to measure pain interference
2010, PainCitation Excerpt :Analysis of differential item functioning (DIF) examines the relationships among item responses, levels of the domain being measured, and subgroup membership. For any given level of domain, the probabilities of endorsing specified item responses should be independent of subgroup membership [23]. In the context of pain interference measurement, persons of different ages, education levels, race/ethnicities, and genders who have equal levels of pain interference should be equally likely to endorse a particular category of a specified PROMIS-PI item.
The development of the EORTC QLQ-C15-PAL: A shortened questionnaire for cancer patients in palliative care
2006, European Journal of CancerItem response theory was used to shorten EORTC QLQ-C30 scales for use in palliative care
2006, Journal of Clinical EpidemiologyCitation Excerpt :We used the contingency table method described previously [18] to test for DIF between subgroups defined by age, gender, cancer site, language, and stage (i.e., palliative vs. nonpalliative). For a more detailed description of the DIF analysis method, see Petersen et al. [18]; see also Groenvold et al. [19] and Kreiner et al. [20]. The effect of possible DIF findings with regard to age, gender, and cancer site were evaluated by dividing the palliative care patients into subgroups according to DIF and then comparing the properties of the shortened scales in these subgroups.