Back-transformation of treatment differences-an approximate method

European Journal of Clinical Nutrition

Volumn 68, Issue 2, 2014, Pages 277-280

  Laursen, R P ^a   Dalskov, S M ^a   Damsgaard, C T ^a   Ritz, C ^a  

^a UNIVERSITY OF COPENHAGEN   (Denmark)

Author keywords

[No Author keywords available]

Indexed keywords

ANIMALS; CONFIDENCE INTERVALS; CYTOKINES; DATA INTERPRETATION, STATISTICAL; DENMARK; DIETARY SUPPLEMENTS; FISH OILS; HUMANS; IMMUNITY; INFANT; INFANT FORMULA; MILK; RANDOMIZED CONTROLLED TRIALS AS TOPIC; SKINFOLD THICKNESS; STATISTICS AS TOPIC; TREATMENT OUTCOME;

EID: 84893742162     PISSN: 09543007     EISSN: 14765640     Source Type: Journal    
DOI: 10.1038/ejcn.2013.259     Document Type: Article

References (22)

1. Belenchia AM, Tosh AK, Hillman LS, Peterson CA. Correcting vitamin D insufficiency improves insulin sensitivity in obese adolescents: a randomized controlled trial. Am J Clin Nutr 2013; 97: 774-781.
2. Damsgaard CT, Frokiaer H, Andersen AD, Lauritzen L. Fish oil in combination with high or low intakes of linoleic acid lowers plasma triacylglycerols but does not affect other cardiovascular risk markers in healthy men. J Nutr 2008; 138: 1061-1066.
3. Damsgaard CT, Lauritzen L, Kjaer TM, Holm PM, Fruekilde MB, Michaelsen KF et al. Fish oil supplementation modulates immune function in healthy infants. J Nutr 2007; 137: 1031-1036.
4. Thankachan P, Selvam S, Surendran D, Chellan S, Pauline M, Abrams SA et al. Efficacy of a multi micronutrient-fortified drink in improving iron and micro-nutrient status among schoolchildren with low iron stores in India: a randomised, double-masked placebo-controlled trial. Eur J Clin Nutr 2013; 67: 36-41.
5. Burns-Whitmore BL, Haddad EH, Sabate J, Jaceldo-Siegl K, Tanzman J, Rajaram S. Effect of n-3 fatty acid enriched eggs and organic eggs on serum lutein in free-living lacto-ovo vegetarians. Eur J Clin Nutr 2010; 64: 1332-1337.
6. Ahuja KD, Ashton EL, Ball MJ. Effects of a high monounsaturated fat, tomato-rich diet on serum levels of lycopene. Eur J Clin Nutr 2003; 57: 832-841.
7. Altman DG. Practical Statistics for Medical Research. Chapman & Hall/CRC: London, UK, 1991.
8. Manning WG. The logged dependent variable, heteroscedasticity, and the retransformation problem. J Health Econ 1998; 17: 283-295.
9. Duan N. Smearing Estimate: a Nonparametric Retransformation Method. J Am Stat Assoc 1983; 78: 605-610.
10. Keene ON. The log transformation is special. Stat Med 2007; 14: 811-819.
11. Feng C, Wang H, Lu N, Tu XM. Log transformation: application and interpretation in biomedical research. Stat Med 2013; 32: 230-239.
12. Bland JM, Altman DG, Rohlf FJ. In defence of logarithmic transformations. Stat Med 2013; 32: 3766-3769.
13. Stratton RJ, Stubbs RJ, Elia M. Bolus tube feeding suppresses food intake and circulating ghrelin concentrations in healthy subjects in a short-term placebo-controlled trial. Am J Clin Nutr 2008; 88: 77-83.
14. Thurnham DI, McCabe LD, Haldar S, Wieringa FT, Northrop-Clewes CA, McCabe GP. Adjusting plasma ferritin concentrations to remove the effects of subclinical inflammation in the assessment of iron deficiency: a meta-analysis. Am J Clin Nutr 2010; 92: 546-555.
15. Zimmermann MB, Hess SY, Molinari L, De BB, Delange F, Braverman LE et al. New reference values for thyroid volume by ultrasound in iodine-sufficient schoolchildren: a World Health Organization/Nutrition for Health and Development Iodine Deficiency Study Group Report. Am J Clin Nutr 2004; 79: 231-237.
16. Bland JM, Altman DG. The use of transformation when comparing means. BMJ 1996; 312: 1153.
17. van der Vaart AW. Asymptotic Statistics. Cambridge University Press: Cambridge, UK, 1998.
18. Hothorn T, Bretz F, Westfall P. Simultaneous Inference in General Parametric Models. Biom J 2008; 50: 346-363.
19. Swayne BG, Behan NA, Williams A, Stover PJ, Yauk CL, MacFarlane AJ. Supplemental dietary folic acid has no effect on chromosome damage in erythrocyte progenitor cells of mice. J Nutr 2012; 142: 813-817.
20. Hebert JR, Hurley TG, Peterson KE, Resnicow K, Thompson FE, Yaroch AL et al. Social desirability trait influences on self-reported dietary measures among diverse participants in a multicenter multiple risk factor trial. J Nutr 2008; 138: 226S-234S.
21. R Core Team. R: A Language and Environment for Statistical Computing. R Core Team. R Foundation for Statistical Computing: Vienna, Austria, 2013, URL http://www.R-project.org/.
22. Weisberg S. Applied Linear Regression, 3rd edn. John Wiley & Sons: Hoboken, NJ, USA, 2005.