William Johnson, Ph.D.


(225) 763-2932
(225) 763-2879
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Dr. Johnson holds the Ph.D. degree in Biostatistics from Tulane University, Master of Applied Statistics from North Carolina State University, Master of Science in Biometry from Louisiana State University Health Sciences Center and Bachelor of Science in Mathemetics from Southeastern. Louisiana State University.


Dr. Johnson's research is strongly linked to providing consultation, guidance and analytical collaborative resources to researchers in the basic, clinical and population sciences including investigators engaged in research to discover whether their findings translate across these disciplines. The biostatistical expertise needed in these collaborations spans a broad range of statistical methods and often create opportunities to develop new methods. Dr. Johnson's interests have always been stimulated by the challenges of new scientific discovery and the search for novel and improved statistical appoaches that enhance the analytical interpretation of new discovery leading to improved health.


W.D. Johnson, M.M. Brashear, J. Rood, D.H. Ryan. “Incremental weight loss improves
cardiometabolic risk in extremely obese adults.” American Journal of Medicine 2011 Oct; 124(10): 931-938.

R.L. Newton Jr., C. Bouchard, G.A. Bray, F.L. Greenway, W.D. Johnson, E. Ravussin, D.H. Ryan, P.T. Katzmarzyk. Abdominal Adiposity Depots are Correlates of Adverse Cardiometabolic Risk Factors in Caucasian and African American Adults. Nutrition and Diabetes 1:E2, 2011.

T.L. Abell, W.D. Johnson, A. Kedar, J.M. Runnels, J. Thompson, E.S. Weeks, A. Minocha, M.E. Griswold. A double-masked, randomized, placebo-controlled trial of temporary endoscopic mucosal gastric electrical stimulation for gastroparesis. Gastrointestinal Endoscopy 2011 Sep; 74(3):496-503 e3.

D.M. Harrington, C. Tudor-Locke, C.M. Champagne, S.T. Broyles, D.W. Harsha, B.M. Kennedy, W.D. Johnson, R. Allen, P.T. Katzmarzyk. Step-based translation of physical activity guidelines in the lower Mississippi Delta. Applied Physiology, Nutrition, and Metabolism 2011 Jul; 36:583-585.

P.T. Katzmarzyk, G.A. Bray, F.L. Greenway, W.D. Johnson, R.L. Newton, Jr., E. Ravussin, D.H. Ryan, C. Bouchard Ethnic-specific BMI and Waist Circumference thresholds. Obesity Silver Spring) 2011 Jun; 19(6): 1272-1278. Epub ahead of print Jan 6, 2011.

S.M. Camhi, S.B. Sisson, W.D. Johnson, P.T. Katzmarzyk, C. Tudor-Locke. Accelerometer-determined moderate intensity lifestyle activity and cardiometabolic health. Preventive Medicine, 2011 May 1; 52(5): 358-360. Epub ahead of print Feb 4 2011.

E.P. Plaisance, F.L. Greenway, A. Boudreau, K.L. Hill, W.D. Johnson, R.A. Krajcik, C.E. Perrone, N. Orentreich, W.T. Cefalu, T.W. Gettys. Dietary methionine restriction increases fat oxidation in obese adults with metabolic syndrome. Journal of Clinical Endocrinology and Metabolism 2011 May; 96(5): E8336-840. Epub ahead of print Feb 23, 2011.

C. Tudor-Locke, C. Leonardi, W.D. Johnson, P.T. Katzmarzyk, T.S. Church. Accelerometer steps/day translation of moderate-to-vigerous activity. Preventive Medicine 2011 Jul-Aug; 53(1-2): 31-33. Epub ahead of print Feb 2, 2011.

A.K. Gupta, M.M. Brashear, W.D. Johnson. Prediabetes and prehypertension in healthy adults are associated with low vitamin D levels. Diabetes Care 2011 Mar; 34(3): 658-660. Epub ahead of print Jan 31, 2011.

R.M. Brouillette, C.K. Martin, J.B. Correa, A.B. Davis, H. Han, W.D. Johnson, H.C. Foil, A. Hymel, J.N. Keller. Memory For Names Test Provides A Useful Confrontational Naming Task For Aging and Continuum of Dementia. Journal of Alzheimer Disease 2011 Jan 1; 23(4): 665-671. Epub ahead of print Feb 7, 2011.

T.S. Church, S.N. Blaire, S. Cocreham, N. Johannsen, W. Johnson, K. Kramer, C.R. Mikus, V. Myers, M. Nauta, R.Q. Rodarte, L. Sparks, A. Thompson, C.P. Earnest. Effects of aerobic and resistance training on hemoglobin A1C levels in patients with type 2 diabetes: a randomized controlled trial. Journal of the American Medical Association 2010 304(20): 2252-2262.

W.H. Replogle, G.R. Barrett, W.D. Johnson. Outcome evaluation of ACL reconstruction using patellar tendon allograft. Arthroscopy 2010 Aug; 26(8): 1018-1019. Epub ahead of print Jul 26; 7(1).

L. Zhang, J. Wu. W.D. Johnson. Empirical study of six tests for equality of populations with zero-inflated continuous distributions. Communications in Statistics – Simulations and Computations 2010 39: 1181-1196.

A.J. Stull, K.C. Cash, W.D. Johnson, C.M. Champagne, W.T, Cefalu Bioactives in blueberries improve insulin sensitivity in obese, insulin-resistant men and women. Journal of Nutrition, 2010 Oct; 140(10): 1764-1768. Epub ahead of print Aug 19, 2010.

W.D. Johnson, G.G. Koch. Intraclass Correlation Coefficient. In International Encyclopedia of Statistical Science, Miodrag Lovric, Ed. Springer, 2010.

D.A. Williamson, H. Han, W.D. Johnson, T.M. Stewart, D.W. Harsha. Longitudinal study of body weight changes in children: who is gaining and who is losing weight? Obesity 2011 Mar; 19(3):667-670. Epub ahead of print Sep 30, 2010.

D.H. Ryan, W.D. Johnson, V.H. Myers, T.L. Hudnall, M.M. McGlone, J. Rood, P.J. Brantley, G.A. Bray, A.K. Gupta, A.P. Broussard, B.G. Barootes, B.L. Elkins, D.E. Gaudin, R.L. Savory, R.D. Brock, G. Datz, S.R. Pothakarmuri, T. McKnight, K. Steniof, L.V. Sjostrom. Non-surgical weight loss for extreme obesity in primary care settings: Results of the Louisiana Obese Subjects Study. Archives Internal Medicine 2010.Jan 25; 170(2):146-154.

C. Tudor-Locke, W.D. Johnson, P.T. Katzmarzyk. “Accelerometer-determined steps per day in U.S. adults. Medicine and Science in Sports and Exercise. 2009 Jul; 41(7):1384-1391.

A.D. Penman, W.D. Johnson. Complementary log-log regression for the estimation of covariate-adjusted prevalence ratios in the analysis of data from cross-sectional studies. Biometrical Journal 2009 Jun 51(3):433-442.

W.D. Johnson, J. Kroon, F.L. Greenway, C. Bouchard, D. Ryan, P.T. Katzmarzyk. Prevalence of risk factors for metabolic syndrome in adolescents: NHANES 2001-2006 Archives of Pediatrics and Adolescent Medicine. 2009 Apr; 163(4):371-7.

W.D. Johnson, C. Bouchard, R. Newton, Jr., D. Ryan, P.T. Katzmarzyk. Ethnic differences in self-reported and measured obesity. Obesity 2009 Mar;17(3):571-7.

C.J. Christensen, W.D. Johnson, T.L. Abell. Patients with cyclic vomiting pattern and diabetic gastropathy have more: migraines, abnormal electrogastrograms and gastric emptying. Scandinavian Journal of Gastroenterology. 2008 43(9):1076-1081.

H. Taylor, J. Liu, G. Wilson, S.H. Golden, E. Crook, C.D. Brunson, M. Steffes, W.D. Johnson, J.H. Sung. Distinct component profiles and high risk among African Americans with the metabolic syndrome: The Jackson Heart Study. Diabetes Care, 2008 Jun 31(6):1248-1253.
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