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Body mass index and all-cause mortality among type 2 diabetes mellitus patients

Published:September 08, 2017DOI:https://doi.org/10.1016/j.ejim.2017.09.008
      We thank Safiri S and Ayubi E [
      • Safiri S.
      • Ayubi E.
      Body mass index and all-cause mortality among type 2 diabetes mellitus patients: Methodological issues.
      ]. for their methodological observations to our manuscript [
      • Salinero-Fort M.A.
      • San Andrés-Rebollo F.J.
      • Gómez-Campelo P.
      • de Burgos-Lunar C.
      • Cárdenas-Valladolid J.
      • Abánades-Herranz J.C.
      • et al.
      Body mass index and all-cause mortality among type 2 diabetes mellitus patients: findings from the 5-year follow-up of the MADIABETES cohort.
      ]. We agree with their affirmation that the categorization of variables implies loss of information, but we prefer to do so to be able to compare our results with other studies. Indeed, the majority of studies included in a recent systematic reviews [
      • Flegal K.M.
      • Kit B.K.
      • Orpana H.
      • Graubard B.I.
      Association of all-cause mortality with overweight and obesity using standard bodymass index categories: a systematic review and meta-analysis.
      ,
      • Chang H.W.
      • Li Y.H.
      • Hsieh C.H.
      • Liu P.Y.
      • Lin G.M.
      Association of bodymass index with allcause mortality in patients with diabetes: a systemic review and meta-analysis.
      ,
      • Zaccardi F.
      • Dhalwani N.N.
      • Papamargaritis D.
      • Webb D.R.
      • Murphy G.J.
      • Davies M.J.
      • et al.
      Nonlinear association of BMI with all-cause and cardiovascular mortality in type 2 diabetes mellitus: a systematic review and meta-analysis of 414,587 participants in prospective studies.
      ,
      • Aune D.
      • Sen A.
      • Prasad M.
      • Norat T.
      • Janszky I.
      • Tonstad S.
      • et al.
      BMI and all-cause mortality: systematic review and non-linear dose-response meta-analysis of 230 cohort studies with 3.74 million deaths among 30.3 million participants.
      ] use BMI categories based on recommendations from the World Health Organization [
      Obesity: preventing and managing the global epidemic: report of a WHO consultation.
      ], the National Heart, Lung, and Blood Institute [
      • Expert Panel on the Identification, Evaluation, and Treatment of Overweight in Adults
      Clinical guidelines on the identification, evaluation, and treatment of overweight and obesity in adults: executive summary.
      ], and local criteria due to the statistical distribution of the data. Many studies from these systematic reviews were categorized as being of high quality according to different scales [
      • Chang H.W.
      • Li Y.H.
      • Hsieh C.H.
      • Liu P.Y.
      • Lin G.M.
      Association of bodymass index with allcause mortality in patients with diabetes: a systemic review and meta-analysis.
      ]. In this sense, the Newcastle-Ottawa Quality assessment scale considers as “better” those cohort studies that allow comparability on the basis of the design or the analysis.

      Keywords

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