Validity and reliability testing of two instruments to measure breast cancer patients' concerns and information needs relating to radiation therapy

Georgia K B Halkett, Linda J Kristjanson, Georgia K B Halkett, Linda J Kristjanson

Abstract

Background: It is difficult to determine the most effective approach to patient education or tailor education interventions for patients in radiotherapy without tools that assess patients' specific radiation therapy information needs and concerns. Therefore, the aim of this study was to develop psychometrically sound tools to adequately determine the concerns and information needs of cancer patients during radiation therapy.

Patients and methods: Two tools were developed to (1) determine patients concerns about radiation therapy (RT Concerns Scale) and (2) ascertain patient's information needs at different time point during their radiation therapy (RT Information Needs Scale). Tools were based on previous research by the authors, published literature on breast cancer and radiation therapy and information behaviour research. Thirty-one breast cancer patients completed the questionnaire on one occasion and thirty participants completed the questionnaire on a second occasion to facilitate test-retest reliability. One participant's responses were removed from the analysis. Results were analysed for content validity, internal consistency and stability over time.

Results: Both tools demonstrated high internal consistency and adequate stability over time. The nine items in the RT Concerns Scale were retained because they met all pre-set psychometric criteria. Two items were deleted from the RT Information Needs Scale because they did not meet content validity criteria and did not achieve pre-specified criteria for internal consistency. This tool now contains 22 items.

Conclusion: This paper provides preliminary data suggesting that the two tools presented are reliable and valid and would be suitable for use in trials or in the clinical setting.

References

    1. Delaney G, Barton M, Jacob S. Estimation of an Optimal Radiotherapy Utilization Rate for Breast Carcinoma. Cancer. 2003;98:1977–1986. doi: 10.1002/cncr.11740.
    1. Hammick M, Tutt A, Tait D. Knowledge and Perception regarding radiotherapy and radiation in patients receiving radiotherapy: a qualitative study. Eur J Cancer Care. 1998;7:103–112. doi: 10.1046/j.1365-2354.1998.00072.x.
    1. Long L. Being informed: undergoing radiation therapy. Cancer Nurs. 2001;24:463–468. doi: 10.1097/00002820-200112000-00007.
    1. Halkett GKB, Arbon P, Scutter SD, Borg M. The breast cancer patient's experience of making radiation therapy treatment decisions. The Radiographer. 2005;52:17–21.
    1. Gamble Communication and information: the experience of radiotherapy patients. Eur J Cancer Care. 1998;7:153–161. doi: 10.1046/j.1365-2354.1998.00097.x.
    1. Arraras JI, Wright S, Greimel E, Holzner B, Kuljanic-Vlasic K, Velikova G, Eisemann M, Visser A. Development of a questionnaire to evaluate the information needs of cancer patients: the EORTC questionnaire. Patient Educ Couns. 2004;54:235–241. doi: 10.1016/S0738-3991(03)00240-4.
    1. Galloway S, Graydon JE, Harrison DE, Evans-Boyden B, Palmer-Wickham S, Burlein-Hall S. Informational needs of women with a recent diagnosis of breast cancer: development and initial testing of a tool. J Adv Nurs. 1997;25:1175–1183. doi: 10.1046/j.1365-2648.1997.19970251175.x.
    1. Thomas R, Kaminski E, Stanton E, Williams M. Measuring information strategies in oncology - developing an information satisfaction questionnaire. Eur J Cancer Care. 2004;13:65–70. doi: 10.1111/j.1365-2354.2004.00445.x.
    1. Jahraus D, Sokolosky S, Thurston N, Guo D. Evaluation of an education program for patients with breast cancer receiving radiation therapy. Cancer Nurs. 2002;25:266–275. doi: 10.1097/00002820-200208000-00002.
    1. Dunn J, Steginga S, Rose P, Scott J, Allison R. Evaluating patient education materials about radiation therapy. Patient Educ Couns. 2004;52:325–332. doi: 10.1016/S0738-3991(03)00108-3.
    1. French J, Yu M. The impact of information videos on patient satisfaction for patients undergoing radiation therapy. Can J Med Radiat Technol. 2003;34:2–5.
    1. Fieler V, Wlasowicz GS, Mitchell ML, Jones LS, Johnson J. Information preferences of patients undergoing radiation therapy. Oncol Nurs Forum. 1996;23:1603–1608.
    1. Haggmark C, Bohman L, Ilmoni-Brandt K, Naslund I, Sjoden PO, Nilsson B. Effects of information supply on satisfaction with information and quality of life in cancer patients receiving curative radiation therapy. Patient Educ Couns. 2001;45:173–179. doi: 10.1016/S0738-3991(01)00116-1.
    1. Zissiadis Y, Provis A, Harper E, Kearney E, McDonald L, Dhaliwal S. Patient satisfaction in radiation oncology. Australas Radiol. 2006;50:455–462. doi: 10.1111/j.1440-1673.2006.01601.x.
    1. Harrison D, Galloway S, Graydon J, Palmer-Wickham S, Rich-van der Bij L. Information needs and preference for information of women with breast cancer over a first course of radiation therapy. Patient Educ Couns. 1999;38:217–225. doi: 10.1016/S0738-3991(99)00009-9.
    1. Wilson TD. Models in information behaviour research. Journal of Documentation. 1999;55:249–270. doi: 10.1108/EUM0000000007145.
    1. Mastaglia B, Toye C, Kristjanson L. Ensuring content validity in instrument development: challenges and innovative approaches. Contemp Nurse. 2003;14:281–291.
    1. Zigmond AS, Snaith RP. The Hospital Anxiety and Depression Scale. Acta Psychiatrica Scandinavia. 1983;67:361–370. doi: 10.1111/j.1600-0447.1983.tb09716.x.
    1. Howie JG, Heaney DJ, Maxwell M, Walker JJ. A comparison of a Patient Enablement Instrument (PEI) against two established satisfaction scales as an outcome measure of primary care consultations. Fam Pract. 1998;15:165–171. doi: 10.1093/fampra/15.2.165.
    1. Merluzzi T, Nairn R, Hegde K, Martinez Sanchez M, Dunn L. Self-efficacy for coping with cancer: revision of the cancer behavior inventory. Pscyhooncology. 2001;10:206–217. doi: 10.1002/pon.511.
    1. Nunnally JC. Psychometric theory. 3rd . New York , McGraw-Hill; 1994.
    1. Carmines E, Zeller R. Quantitative Applications in the Social Sciences. Beverly Hills, California , Sage; 1979. Reliability and validity assessment.
    1. Norman G, Streiner D. Biostatistics: The Bare Essentials. Hamilton, Ontario , B.C. Decker; 2000.
    1. Bland M, Altman D. Comparing two methods of clinical measurement: a personal history. Int J Epidemiol. 1995;24:S7–S14.
    1. Halkett GKB, Arbon P, Scutter SD, Borg M. The phenomenon of making decisions during the experience of early breast cancer. Eur J Cancer Care. 2007;16 :322–330. doi: 10.1111/j.1365-2354.2007.00778.x.

Source: PubMed

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