Center for Global Health Faculty

Academic Degrees

Departmental Address

Contact Information

Email:

mchaudha+jhsph.edu

Phone:

(410) 502-0741

Fax:

(410) 502-6733

Research and Professional Experience

My current research efforts comprise the following four areas: 1. Design and analysis of individual as well as group randomized clinical trials evaluating novel interventions for the prevention of TB and HIV-AIDS. Currently, I am involved in several randomized studies evaluating the impact of male circumcision on HIV and STDs in Uganda and those evaluating innovative strategies for the prevention of dual TB and HIV-AIDS epidemic in children and adults in Ethiopia, Uganda, Brazil, South Africa and India. This collaborative research requires careful and sometimes innovative application of modern statistical methodologies. 2. Development and evaluation of interval estimation methods for incremental cost-effectiveness ratios for individual and group randomized trials in health services research. These methods are quickly adaptable to other complex non-linear statistics. 3. Survey sampling techniques involving the estimation of variance and inference from unequal probability, multistage sample designs. 4. Statistical computing primarily in SAS and R. Recently, I have written a SAS macro to generate optimal randomization schemes for group randomized trials balancing potential baseline covariates between the study arms.

Keywords

Biostatistics; Statistical Epidemiology; Group Randomized Trials; Incremental Cost-Effectiveness Ratio; Survey Sampling; International Health; Tuberculosis; HIV-AIDS

Honors and Awards

1994, 1995 Biostatistics/UNC-CH Travel Grants 1990 Govt. Pakistan/Punjab University Scholarship to study in US 1989 UNESCO Award for a course in Indian Statistical Institute, India 1987 ISI Award to attend ISI Meeting and IASS Workshop in Tokyo 1983 British Council Scholarship to Study in UK 1979 2nd Position in Merit in M.Sc. Statistics at Islamia University

Selected Publications

Most recent 20 publications:

1. Statistical Methods for Correlated Data with Applications to the Health Sciences, Third Edition by Mohamed M. Shoukri, Mohammad A. Chaudhary; Chapman & Hall/CRC; 3 edition (May 29, 2007) 2. Chaudhary, M.A. and Moulton, L.H., A SAS Macro for Constrained Randomization of Group Randomized Trials, Computer Methods and Programs in Biomedicine, September 2006, Volume 83, Issue 3, 205-210. 3. Asim F. Belgaumi, Lobna Shalaby, Amani Al-Kofide, Chaudhary M.A., Christopher Alviedo, Rajeh Sabbah: Treatment of a Clinically Determined Lower-Risk Subset of Stage III Non-Lymphoblastic Non-Hodgkin Lymphoma with Less Intensive Therapy does not Impact Negatively on Outcome, Journal of Pediatric Blood and Cancer, March 2006; 46(3): 367-71. 4. M E Fawzy, M A Stefadouros, H Hegazy, F El Shaer, Chaudhary M.A., and F A Fadley: Long term clinical and echocardiographic results of mitral balloon valvotomy in children and adolescents, Heart, 2005;91(6); 743-8 5. Shoukri, M.M., Chaudhary M.A., and Al-Halees, A.: Estimating P(Y < X) when X and Y are Paired Exponential Variables. Journal of Statistical Computation and Simulation, January 2005; Vol. 75, No. 1, 25-38. 6. Hannoush H, Fawzy ME, Stefadouros M, Moursi M, Chaudhary M.A., Dunn B.: Regression of Significant Tricuspid Regurgitation after Mitral Balloon Valvotomy for Severe Mitral Stenosis, The American Heart Journal, 2004;148(5):865-70. 7. Mohamed E. Fawzy, Walid Hassan, M. Stefadouros, Mohamed Moursi, Faez El Shaer and Chaudhary, M.A.: Prevalence and the Fate of Pulmonary Hypertension, The Journal of Heart Valve Diseases, 2004;13(6):942-8 8. Hussam M Bin Yousef, Osama Al Malik, Alaa Kandil, Chaudhary, M.A., Ralph A. Sorbris: Surgical Management of Breast Cancer in Saudi Arabia Before and After Outreach Activities, World Journal of Surgery, Vol. 28, No. 9, September, 2004; 935-937. 9. Shoukri, M.M., Chaudhary M.A. and Asyali M.H.: Confidence Intervals for Limiting Availability Assuming Correlated Rayleigh Random Variables. Journal of Statistical Research, Vol. 37, No. 2, 183-191, 2003. 10. Gutierrez, M.I., Siraj, A.K., Bhargava M., Ozbek, U., Banawali S., Chaudhary, M.A., El Solh H., Bhatia K.: Concurrent Methylation of Multiple Genes in Childhood ALL: Correlation with Phenotype and Molecular Subgroup. Leukemia, Vol. 17, 1845-1850, 2003. 11. Shoukri M.M., Chaudhary M.A., Mohamed G.H.: Evaluating Normal Approximation Confidence Intervals for Measures of 2x2 Associations with Applications to Twin Data. Biometrical Journal, Vol. 44, 1-14, 2002. 12. Cooke TDV, Harrison L, Khan B, Scudamore RA, and Chaudhary, M.A.: Analysis of Limb Alignment in the Pathogenesis of Osteoarthritis; A comparison of Saudi Arabian and Canadian Cases. Rheumatology International, Vol. 22, 160-164, 2002. 13. Seth P, Alrajhi AA, Kagevi E, Chaudhary M.A., Colcol E, Sahovic E, Aljurf M, Gyger M.: Hepatitis B Virus Reactivation with Clinical Flare in Allogeneic Stem Cell Transplants with Chronic Graft vs. Host Disease. Bone Marrow Transplantation, Vol. 30, 189-194, 2002. 14. Muna M. Baslain, Osama A. Al-Malik, Saif S. Al-Sobhi, Ezzeldin Ibrahim, Adnan Ezzat, Dahish Ajarim, Asma Tulba, Chaudhary, M.A., and Ralph A. Sorbris: Decreased Auxiliary Lymph Node Retrieval in Patients after Neoadjuvant Chemotherapy. American Journal of Surgery, Vol. 184, Issue 4, 299-301, 2002. 15. Ziad R. Bulbul, Mohammed Omer Galal, Alsayed Mahmoud, Bettina Narden, Laszlo Solymar, Chaudhary, M.A., and Zuhair Al-Halees: Arterial Complications Following Cardiac Catheteration in Children <10 Kg., Randomized to Two Heparin Doses: a Prospective Double Blind Study. Asian Cardiovascular and Thoracic Annals, Vol. 10, No. 2, 129-32, 2002. 16. Ali S. Alzahrani, Majid Al Mandil, Chaudhary, M.A., Ahmed M, Gamal Eldin Mohammed: Frequency and Predictive Factors of Malignancy in Residual Thyroid Tissue and Cervical Lymph Nodes after Partial Thyroidectomy in Differentiated Thyroid Cancer. Surgery, Vol. 131, 443-449, 2002. 17. Chaudhary, M.A., and Hannan, M.A.: A SAS Macro for the Analysis of Cell Survival Curves, Computer Methods and Programs in Biomedicine. Vol. 67, 201-207, 2002. 18. Chaudhary, M.A. and Sen, Pranab K.: Reconciliation of Asymptotics for UPS Sampling Without Replacement, Journal of Statistical Planning and Inference. Vol. 102, Issue 1, 71-81, 2002. 19. Bassam Bin-Abbas, Horia Mawlawi, Nadia Sakati, Yasser Khafaja, Chaudhary, M.A.: Ednocrine Sequelae of Childhood Craniopharyngioma. Journal of Pediatric Endocrinology & Metabolism, Vol. 14, No.7, 869-74, 2001. 20. Hannan M.A., Siddiqui Y., Rostom A., Al-Ahdal M.N., Chaudhary, M.A., Kunhi M.: Evidence of DNA Repair/Processing Defects in Cultured Skin Fibroblasts from Breast Cancer Patients. Cancer Research, Vol. 61(9), 3627-31, May 1, 2001.