Costas Christophi, PhD

Costas Christophi is an Assistant Research Professor in the Department of Epidemiology and Biostatistics.

• Phone: (301) 881-9260
• Fax: (301) 881-3742
• Email: costas@biostat.bsc.gwu.edu

After completing his doctoral dissertation on distances in random tries via analytic probability at The George Washington University, Professor Christophi joined the SPHHS research faculty in 2004, and now serves as a statistician on the NIH's Diabetes Prevention Program (DPP). He previously investigated the distribution of a multiplicative risk function for the Environmental Protection Agency and served as a special volunteer with the Biometry Research Group for the National Cancer Institute, researching selection bias.

A native of Cyprus, Dr. Christophi is a member of the Golden Key National Honor Society, an avid soccer player, and has a listing in Who's Who in America.

Education

Bachelor of Science (Business Administration), Boston University, 1994
Master of Science (Statistics), The George Washington University, 1999
Doctor of Philosophy (Statistics), The George Washington University, 2004

Teaching

Introduction to Business and Economic Statistics, Department of Statistics (Columbian College of Arts and Sciences)
Introduction to Statistics for Social Sciences, Department of Statistics (Columbian College of Arts and Sciences)
Business and Economic Statistics I, Department of Statistics (Columbian College of Arts and Sciences)

Research

Professor Christophi's primary research interests are clinical trials and the probabilistic analysis of algorithms. His recent statistical work with DPP has focused on gestational diabetes, the ankle-brachial index, and diabetic retinopathy.

Community Service

Professor Christophi is a member of the American Statistical Association and served as a referee for the Journal of the Iranian Statistical Society.

Departments

• Epidemiology and Biostatistics

Institutes & Centers

• Biostatistics Center

Publications

• The Obesity Epidemic and Future Emergency Responders.
  Tsismenakis A, Christophi C, Buress J, Kinney A, Kim M, and Kales S. (2009) The Obesity Epidemic and Future Emergency Responders. Obesity (published in advance online).
• Main Determinants of Cigarette Smoking in Youth.
  Christophi C, Savvides E, Warren C, Demokritou P, and Connolly G. (2009) Main Determinants of Cigarette Smoking in Youth. Preventive Medicine, 48, 232-236.
• Prevention of Diabetes in Women with a History of Gestational Diabetes: The DPP Experience.
  Ratner R, Christophi C, Metzger B, Dabelea D, Bennett P, Pi-Sunyer X, Fowler S, and Kahn S. (2008) Prevention of Diabetes in Women with a History of Gestational Diabetes: The DPP Experience. Journal of Clinical Endocrinology and Metabolism, 93, 4474-4479.
• Implementing the European guidelines for cardiovascular disease prevention in the primary care setting in Cyprus: lessons learned from a health care services study
  Zachariadou T, Stoffers H, Christophi C, Philalithis A, and Lionis C. (2008) Implementing the European guidelines for cardiovascular disease prevention in the primary care setting in Cyprus: lessons learned from a health care services study. BMC Health Services Research, 8, 148.
• Prevalence and Social Environment of Cigarette Smoking in Cyprus Youth.
  Christophi C, Kolokotroni O, Alpert H, Warren C, Jones N, Demokritou P, Connolly G. (2008) Prevalence and Social Environment of Cigarette Smoking in Cyprus Youth. BMC Public Health, 8, 190.
• On Climbing Tries.
  Christophi C and Mahmoud H. (2008) On Climbing Tries. Probability in the Engineering and Informational Sciences, 22, 133-149.
• Hematopoietic Toxicity from Lead-Containing Ayurvedic Medications.
  Kales S, Christophi C, and Saper R. (2007) Hematopoietic Toxicity from Lead-Containing Ayurvedic Medications. Medical Science Monitor, 13, 7, 295-298.
• Factors Associated with Diabetes Onset During Metformin Versus Placebo Therapy in the Diabetes Prevention Program (DPP).
  Lachin J, Christophi C, Edelstein S, Ehrman D, Fowler S, Hamman R, Kahn S, Knowler W, and Nathan D. (2007) Factors Associated with Diabetes Onset During Metformin Versus Placebo Therapy in the Diabetes Prevention Program (DPP). Diabetes, 56, 1153-1159.
• Emergency Duties and Deaths from Heart Disease Among Firefighters in the Unites States.
  Kales S, Soteriades E, Christophi C, and Christiani D. (2007) Emergency Duties and Deaths from Heart Disease Among Firefighters in the Unites States. The New England Journal of Medicine, 356, 12, 1207-1215.
• The Prevalence of Retinopathy in Impaired Glucose Tolerance and Recent-Onset Diabetes in the Diabetes Prevention Program.
  Nathan D, Chew E, Christophi C, Davis M, Fowler S, Goldstein B, Hamman R, Hubbard L, Knowler W, and Molitch M. (2007) The Prevalence of Retinopathy in Impaired Glucose Tolerance and Recent-Onset Diabetes in the Diabetes Prevention Program. Diabetic Medicine, 24, 2, 137-144.
• Cystic Fibrosis Mutational Spectrum and Genotypic/Phenotypic Features in Greek-Cypriots, with Emphasis on Dehydration as Presenting Symptom.
  Yiallouros P, Neokleous V, Zeniou M, Adamidou T, Costi C, Christophi C, Tzetis M, Kanavakis E, and Deltas C. (2007) Cystic Fibrosis Mutational Spectrum and Genotypic/Phenotypic Features in Greek-Cypriots, with Emphasis on Dehydration as Presenting Symptom. Clinical Genetics, 71, 290-292.
• Approximating the distribution function of risk
  Modarres R, Christophi C. Approximating the distribution function of risk. Comp Stat Data Anal 2005;49(4):1053-67.
• The oscillatory distribution of distances in random tries.
  Christophi C, Mahmoud H. The oscillatory distribution of distances in random tries. Ann Applied Prob 2005;15(2):1536-64.
• Randomization technique, allocation concealment, and susceptibility of trials to selection bias.
  Berger V, Christophi C. Randomization technique, allocation concealment, and susceptibility of trials to selection bias. J Modern Applied Stat Methods 2003;2(1):80-6.
• Series approximations in analysis of risk.
  Modarres R, Christophi C. Series approximations in analysis of risk. Comp Sci Stat 2001;33:I2001.
• Distribution of the size of random hash trees, pebbled hash trees and N-trees.
  Christophi C, Mahmoud H. Distribution of the size of random hash trees, pebbled hash trees and N-trees. Stat Prob Letters 2001;53(3):277-82.