Development of Smoking Cessation Health-Related Quality of Life Scale
Main Article Content
Abstract
The purpose of this methodological research was to develop a smoking cessation health-related quality oflife scale and examine the validity and reliability of this measure. The research involved 3 steps: (1) scaledevelopment, (2) expert review of the scale, and (3) testing of the scale. A total of 431 current adult smokersand ex-smokers who visited the smoking cessation clinics in hospitals/ institutes and community pharmaciesparticipated in the study. The initial scale was developed and based on a literature review and semi-structuredinterviews with smokers, ex-smokers, and healthcare professionals. A five-point Likert scale was used as anitem response choice. For psychometric properties, exploratory factor analysis with item analysis was used toexamine the construct validity and reliability of the scale. Known group validity was used to support the evidenceof construct validity. Results indicated that the scale had content validity, construct validity, and high internalconsistency reliability. The scale consisted of 36 items with an overall coefficient alpha 0.93. A four-factorstructure was identified and interpreted as representing four subscales: (1) general well being (18 items), (2)satisfaction (8 items), (3) craving and self-control (4 items), and (4) psychological and emotional problems (6items). The Mann-Whitney-U test revealed ex-smokers who had quit smoking for ³ 3 months reportedsignificantly higher quality of life scores than smokers on the four subscales (P < 0.02), demonstrating theconstruct validity of the scale. The findings provide preliminary evidence of scale validity and reliability.
Downloads
Article Details
References
Cramer, J. A. and Spilker, B. (1998). Quality of life and pharmacoeconomics: An introduction, Lippincott Raven, Philadelphia.
Cummings, K. M., Giovino, G., Jaen, C. R., and Emrich, L. J. (1985). Report of smoking withdrawal symptoms over a 21 day period of abstinence. Addictive Behaviors, 10(4): 373-381.
Erickson, S. R., Thomas, L. A., Blitz, S. G., and Pontius, L. R. (2004). Smoking cessation: A pilot study of the effects on health-related quality of life and perceived work performance one week into the attempt. Annals of Pharmacotherapy, 38(11): 1805-1810.
Fayer, P. M. and Machin, D. (2000). Quality of life: assessment, analysis and interpretation, John Wiley & Sons, Great Britain.
Fiore, M. C., Jaen, C. R,, Baker T. B., Bailey, W. C., Benowitz, N. L., Curry, S. J., Dorfman, S. F., Froelicher, E. S., Goldstein, M. G., Healton, C. G., and Henderson, P. N. (2008). Treating tobacco use and dependence: 2008 update. clinical practice guideline. U.S. Department of Health and Human Services, Rockville, MD.
Guadagnoli, E. and Velicer, W. F. (1988). Relation of sample size to the stability of component patterns. Psychological Bulletin, 103(2): 265-275.
Hatcher, L. (1994). A step-by-step approach to using the SAS system for factor analysis and structural equation modeling, SAS Institute Inc., Cary, NC.
Juniper, E. F, Guyatt, G. H., and Jaeschke, R. (1996). How to develop and validate a new health-related quality of life instrument. In Quality of life and pharmacoeconomics in clinical trial. (Spilker, B., ed.), pp. 49-56. Lippincott Raven, Philadelphia.
Lermankul, W. (2000). Development of the health-related quality of life questionnaires. Thai Journal of Pharmaceutical Sciences, 24(1-2): 71-85.
Lermankul, W. and Meetam, P. (2000). Development of Thai quality of life (SF-36) questionnaires. Thai Journal of Pharmaceutical Sciences, 24(1-2): 92-111.
Lynn, M. R. (1986). Determination and quantification of content validity. Nursing Research, 35(6): 382-385.
Lyons, R. A., Lo, S. V., and Littlepage, B. N. C. (1994). Perception of health amongst ever-smokers and never-smokers: a comparison using the SF-36 Health Survey Questionnaire. Tobacco Control, 3(3): 213-215.
Mulder, I., Tijhuis, M., Smith, H. A., and Kromhout, D. (2001). Smoking cessation and quality of life:The effect of amount of smoking and time since quitting. Preventive Medicine, 33(6): 653-660.
Nunnally, J. C. and Bernstein, I. H. (1994). Psychometrics theory. 3rd ed., McGraw-Hill, New York.
Olufade, A. O., Shaw, J. W., Foster, S. A., Leischow, S. J., Hays, R. D., and Coons, S. J. (1999). Development of the smoking cessation quality of life questionnaire. Clinical Therapeutics, 21(12): 2113-2130.
Polit, D. E. and Hungler, B. P. (1999). Nursing research: principles and method, 6th ed. Lippincott Williams & Wilkins, Philadelphia.
Prochazka, A. V. (2000). New developments in smoking cessation. Chest 117 (4 suppl): 169S-75S.
Shaw, J. W., Coons, S. J., Foster, S. A., Leischow, S. J., and Hays, R. D. (2001). Responsiveness of the smoking cessation quality of life questionnaire. Clinical Therapeutics, 23(6): 957-969.
Smith, M. L. and Glass, G. V. (1987). Research and evaluation in education and the social science s. Prentice-Hall, Englewood Cliffs, NJ.
Spector, P. E. (1992). Summated rating scale construction: An introduction. Sage, Newbury Park, CA.
Stewart, A. L., King, A. C., Killen, J. D., and Ritter, P. (1995). Does smoking cessation improve health-related quality-of-life. Annals of Behavioral Medicine, 17(4): 331-338.
Strandberg, A. Y., Strandberg, T. E., Pitkala, K., Salomaa, V., Tilvis, R. S., and Miettinen, T. A. (2008). The effect of smoking in midlife on health-related quality of life in old age. Archives of Internal Medicine, 168(18): 1968-1974.
Tillmann, M. and Silcock, J. A. (1997). A comparison of smokers’ and ex-smokers’ health-related quality of life. Journal of Public Health Medicine, 19(3): 268-273.
Tinsley, H. E. and Tinsley, D. J. (1987). Uses of factor analysis in counseling psychology research. Journal of Counseling Psychology, 34(4): 414-24.
Ware, J. E. and Sherbourne, C. D. (1992). The MOS 36-item short-form health survey (SF-36): I. conceptual framework and item selection. Medical Care, 30(6): 473-483.
Wilson, D., Parsons, J., and Wakefield, M. (1999). The health-related quality-of-life of never smokers, ex-smokers, and light, moderate, and heavy smokers. Preventive Medicine, 29(3): 139-144.
Wongwiwatthananukit, S. (2003). Role of pharmacists in smoking cessation program. In Ambulatory pharmaceutical care (Jindavijag, B. ed.), pp. 153-174. Thai Hospital Pharmacist Association, Bangkok.
Wongwiwatthananukit, S., Newton, G. D., and Popovich, N. G. (2002). Development and validation of an instrument to assess the self-confidence of students enrolled in the advanced pharmacy practice experiences. American Journal of Pharmaceutical Education, 66(1): 5-19.
World Health Organization. (2008). WHO report on the global tobacco epidemic 2008: the MPOWER Package. WHO, Geneva, Switzerland.
Zillich, A. J., Ryan, M., Adams, A., Yeager, B., and Farris, K. (2002). Effectiveness of pharmacist-based smoking-cessation program and its impact on quality of life. Pharmacotherapy, 22(6): 759-765.