• Bagust, A & Beale, S. (2005) Modelling EuroQol health-related utility values for diabetic complications from CODE-2 data. Health Economics, 14, 217230.
  • Brown, MM, Brown, GC, Sharma, S & Shah, G. (1999) Utility values and diabetic retinopathy. American Journal of Ophthalmology, 128, 32430.
  • Clarke, P, Gray, A & Holman, R. (2002) Estimating utility values for health states of type 2 diabetic patients using the EQ-5D (UKPDS 62). Medical Decision Making, 22, 340349.
  • Clarke, PM, Simon, J, Cull, CA & Holman, RR. (2006) Assessing the Impact of Visual Acuity on Quality of Life in Individuals With Type 2 Diabetes Using the Short Form-36. Diabetes Care, 29, 15061511.
  • Department of Health (1998) Health Survey for England 1996, London, The Stationery Office.
  • Dolan, P, Gudex, C, Kind, P & Williams, A. (1996) The time trade-off method: results from a general population study. Health Economics, 5, 141154.
  • EUROQOL Group (1990) EuroQol - a new facility for the measurement of health-related quality of life. Health Policy, 16, 199208.
  • Glasziou, P, Alexander, J, Beller, E & Clarke, P. (2007) Which health-related quality of life score? A comparison of alternative utility measures in patients with Type 2 diabetes in the ADVANCE trial. Health and Quality of Life Outcomes, 5, 21.
  • Hausman, JA. (1978) Specification Tests in Econometrics. Econometrica, 46, 12511271.
  • Heckman, JJ. (1979) Sample Selection Bias as a Specification Error. Econometrica, 47, 153161.
  • Holman, RR, Paul, SK, Bethel, MA, Matthews, DR & Neil, HA. (2008a) 10-year follow-up of intensive glucose control in type 2 diabetes. The New England Journal of Medicine, 359, 157789.
  • Holman, RR, Paul, SK, Bethel, MA, Neil, HA & Matthews, DR. (2008b) Long-term follow-up after tight control of blood pressure in type 2 diabetes. The New England Journal of Medicine, 359, 156576.
  • Huang, ES, Brown, SE, Ewigman, BG, Foley, EC & Meltzer, DO. (2007) Patient perceptions of quality of life with diabetes-related complications and treatments. Diabetes Care, 30, 247883.
  • Lundkvist, J, Berne, C, Bolinder, B & Jonsson, L. (2005) The economic and quality of life impact of hypoglycemia. The European Journal of Health Economics, 6, 197202.
  • Lung, TW, Hayes, AJ, Hayen, A, Farmer, A & Clarke, PM. (2011) A meta-analysis of health state valuations for people with diabetes: explaining the variation across methods and implications for economic evaluation. Quality of Life Research, 20, 166978.
  • Norman, GR, Sloan, JA & Wyrwich, KW. (2003) Interpretation of changes in health-related quality of life - The remarkable universality of half a standard deviation. Medical Care, 41, 582592.
  • O'Reilly, DJ, Xie, F, Pullenayegum, E, Gerstein, HC, Greb, J, Blackhouse, GK, Tarride, JE, Bowen, J & Goeree, RA. (2011) Estimation of the impact of diabetes-related complications on health utilities for patients with type 2 diabetes in Ontario, Canada. Quality of Life Research, 20, 93943.
  • Redekop, WK, Koopmanschap, MA, Stolk, RP, Rutten, GE, Wolffenbuttel, BH & Niessen, LW (2002) Health-related quality of life and treatment satisfaction in Dutch patients with type 2 diabetes. Diabetes Care, 25, 45863.
  • Schaffer, ME & Stillman, S. (2010) xtoverid: Stata module to calculate tests of overidentifying restrictions after xtreg, xtivreg, xtivreg2 and xthtaylor.
  • Sharma, S, Oliver-Fernandez, A, Bakal, J, Hollands, H, Brown, GC & Brown, MM. (2003) Utilities associated with diabetic retinopathy: results from a Canadian sample. British Journal of Ophthalmology, 87, 25961.
  • UKPDS Group (1991) UK Prospective Diabetes Study VIII: study design, progress and performance. Diabetologia, 34, 877890.
  • UKPDS Group (1998a) UKPDS 33: Intensive blood-glucose control with sulphonylureas or insulin compared with conventional treatment and risk of complications in patients with type 2 diabetes. UK Prospective Diabetes Study (UKPDS) Group. Lancet, 352, 837853.
  • UKPDS Group (1998b) UKPDS 34: Effect of intensive blood-glucose control with metformin on complications in overweight patients with type 2 diabetes. UK Prospective Diabetes Study (UKPDS) Group. Lancet, 352, 854865.
  • Walters, SJ & Brazier, JE. (2005) Comparison of the minimally important difference for two health state utility measures: EQ-5D and SF-6D. Quality of Life Research, 14, 15231532.
  • Wooldridge, JM. (1995) Selection corrections for panel data models under conditional mean independence assumptions. Journal of Econometrics, 68, 115132.
  • Wooldridge, JM. (2010) Econometric analysis of cross section and panel data, Cambridge, Mass.; London, MIT.