Colwell H, Mathias SD, Pasta DJ, Henning JM, Steege JF. A health-related quality of life instrument for symptomatic patients with endometriosis: A validation study. Am J Obstet Gynaecol 1998; 179: 47-55.
Google Scholar
Jones G, Kennedy S, Barnard A, Wong J, Jenkinson C. Development of an Endometriosis Quality of life Instrument: The Endometriosis Health Pro.le-30. Obstet Gynecol 2001; 98: 258-264.
Google Scholar
Wasson J, Keller A, Rubenstein L, Hays R, Nelson E, Johnson D, and the Dartmouth Primary care COOP Project. Benefits and obstacles of health status assessment in ambulatory settings: The clinicians point of view. Med Care 1992; 30: MS42-MS49.
Google Scholar
Coste J, Guillemin F, Pouchet J, Fermanian J. Methodological approaches to shortening composite measurement scales. J Clin Epidemiol 1997; 50: 247-252.
Google Scholar
Pocock SJ. Clinical Trials: A Practical Approach. Chichester: John Wiley and Sons, 1983.
Google Scholar
Ware J, Kosinski M, Keller SD. A 12 item short-form health survey. SF-12: Construction of scales and preliminary tests of reliability and validity. Med Care 1996; 34: 220-233.
Google Scholar
Ware JE, Nelson EC, Sherbourne CD, Stewart AL. Preliminary tests of a 6-item general health survey: A patient application. In: Stewart AL, Ware JE (eds), Measuring Functioning and Wellbeing: The Medical Outcomes Study Approach, London: Duke University Press, 1992.
Google Scholar
Streiner DL, Norman G. Health Measurement Scales: A Practical Guide to Their Development and Use. 2nd ed. Oxford: Oxford University Press, 1995.
Google Scholar
Gandek B, Ware JE, Aaronson NK, et al. Tests of data quality, scaling assumptions, and reliability of the SF-36 in eleven countries: Results from the IQOLA Project. International Quality of Life Assessment. J Clin Epidemiol 1998; 51: 1149-1158.
Google Scholar
Cronbach L. Coefficent alpha and the internal structure of tests. Psychometrika 1951; 16: 297-334.
Google Scholar
Kennedy S. Is there a genetic basis to endometriosis? Semin Reprod Endocrinol 1997; 15: 309-318.
Google Scholar
Jones G, Kennedy S, Jenkinson C. Health-related quality of life measurement in women with common benign gynecological conditions: A systematic review. Am J Obstet Gynecol 2001; 187: 501-511.
Google Scholar
Fitzpatrick R. Applications of health status measures. In: Jenkinson C, (ed.), Measuring Health and Medical Outcomes, London: UCL Press, 1994: 27-41.
Google Scholar
Jenkinson C, Fitzpatrick R, Jenkinson C. Health Status Measurement in Neurological Disorders. Oxford: Radcliffe Medical Press, 2000.
Google Scholar
Bowling A. Measuring Health: A Review of Quality of Life Measurement Scales. Buckingham: Open University Press, 1997.
Google Scholar
Katz JN, Larson MG, Phillips C, Fossel A, Liang MH. Comparative measurement sensitivity of short and longer health status instruments. Med Care 1992; 30: 917-925.
Google Scholar
de Vaus DA. Surveys in Social Research. London: UCL Press, 1991.
Google Scholar
Oppenheim AN. Questionnaire Design, Interviewing and Attitude Measurement. London: Continuum, 1992.
Google Scholar