References
- Wild S, Roglic G, Green A, et al. Global prevalence of diabetes: estimates for the year 2000 and projections for 2030. Diabetes Care 2004;27:1047–1053
- The Diabetic Retinopathy Study Research Group. Photocoagulation treatment of proliferative diabetic retinopathy. Clinical application of Diabetic Retinopathy Study (DRS) findings, DRS Report Number 8. Ophthalmology 1981;88:583–600
- Early Treatment Diabetic Retinopathy Study Research Group. Early photocoagulation for diabetic retinopathy. ETDRS report number 9. Ophthalmology 1991;98:766–785
- Brown MM, Brown GC, Sharma S, Shah G. Utility values and diabetic retinopathy. Am J Ophthalmol 1999;128:324–330
- Sharma S, Chen SJ, Lee FL, et al. Utilities associated with diabetic retinopathy: results from a Canadian sample. Br J Ophthalmol 2003;87:259–261
- Tung TH, Srinivasan G, Mei SS, et al. A community-based study for the utility values associated with diabetic retinopathy among type 2 diabetics in Kinmen, Taiwan. Diabetes Res Clin Pract 2005;68:265–273
- Gupta V, Brown GC, Sharma S, et al. Utility values among glaucoma patients: an impact on the quality of life. Br J Ophthalmol 2005;89:1241–1244
- Brown GC, Brown MM, Sharma S, et al. The reproducibility of ophthalmic utility values. Trans Am Ophthalmol Soc 2001;99:199–203; discussion 203–194
- Jampel HD. Glaucoma patients’ assessment of their visual function and quality of life. Trans Am Ophthalmol Soc 2001;99:301–317
- Wilkinson CP, Ferris FL, Klein RE, et al. Proposed international clinical diabetic retinopathy and diabetic macular edema disease severity scales. Ophthalmology 2003;110:1677–1682
- Raman R, Rani PK, Reddi Rachepalle S, et al. Prevalence of diabetic retinopathy in India: Sankara Nethralaya Diabetic Retinopathy Epidemiology and Molecular Genetics Study report 2. Ophthalmology 2009;116:311–318
- Rabin R, de Charro F. EQ-5D: a measure of health status from the EuroQol Group. Ann Med 2001;33:337–343
- Dolan P. Modeling valuations for EuroQol health states. Med Care 1997;35:1095–1108
- Vyas S, Kumaranayake L. Constructing socio-economic status indices: how to use principal components analysis. Health Policy Plan 2006;21:459-468
- Lamping DL, et al. The community-acquired pneumonia symptom questionnaire: a new, patient-based outcome measure to evaluate symptoms in patients with community-acquired pneumonia. Chest 2002;122:920–929
- Sakthong P, Charoenvisuthiwongs R, Shabunthom R. A comparison of EQ-5D index scores using the UK, US, and Japan preference weights in a Thai sample with type 2 diabetes. Health Qual Life Outcomes 2008;6:71
- Kymes SM, Lee BS. Preference-based quality of life measures in people with visual impairment. Optom Vis Sci 2007;84:809–816
- Johnson JA, Luo N, Shaw JW, et al. Valuations of EQ-5D health states: are the United States and United Kingdom different? Med Care 2005;43:221–228