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10.1186/s13643-015-0083-6 http://scihub22266oqcxt.onion/10.1186/s13643-015-0083-6 C4511978!4511978 !26202162     free     free     free Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\26202162 .jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117       Syst+Rev 2015 ; 4 (ä): 98 Nephropedia Template TP {{tp|p=26202162 |t=2015. Handling trial participants with missing outcome data when conducting a meta-analysis: a systematic survey of proposed approaches |pdf=|usr=}}{{26202162 }} gab.com Text Handling trial participants with missing outcome data when conducting a meta-analysis: a systematic survey of proposed approaches JO: Syst Rev http://www.kidney.de/pget.php?&tw=1&pmid=26202162 #FOAvip BACKGROUND: When potentially associated with the likelihood of outcome, missing participant data represents a serious potential source of bias in randomized trials. Authors of systematic reviews frequently face this problem when conducting meta-analyses. The objective of this study is to conduct a systematic survey of the relevant literature to identify proposed approaches for how systematic review authors should handle missing participant data when conducting a meta-analysis. METHODS: We searched MEDLINE and the Cochrane Methodology register from inception to August 2014. We included papers that devoted at least two paragraphs to discuss a relevant approach for missing data. Five pairs of reviewers, working independently and in duplicate, selected relevant papers. One reviewer abstracted data from included papers and a second reviewer verified them. We summarized the results narratively. RESULTS: Of 9,138 identified citations, we included 11 eligible papers. Four proposed general approaches for handling dichotomous outcomes, and all recommended a complete case analysis as the primary analysis and additional sensitivity analyses using the following imputation methods: based on reasons for missingness (n?=?3), relative to risk among followed up (n?=?3), best-case scenario (n?=?2), and worst-case scenario (n?=?3). Three of these approaches suggested taking uncertainty into account. Two papers proposed general approaches for handling continuous outcomes, and both proposed a complete case analysis as the reference analysis and the following imputation methods as sensitivity analyses: based on reasons for missingness (n?=?2), based on the mean observed in the same trial or other trials (n?=?1), and based on informative missingness differences in means (n?=?1). The remaining eligible papers did not propose general approaches but addressed specific statistical issues. CONCLUSIONS: All proposed approaches for handling missing participant data recommend conducting a complete case analysis for the primary analysis and some form of sensitivity analysis to evaluate robustness of results. Although these approaches require further testing, they may guide review authors in addressing missing participant data. Twit Text FOAVip Handling trial participants with missing outcome data when conducting a meta-analysis: a systematic survey of proposed approaches ????Syst Rev http://www.kidney.de/pget.php?&tw=1&pmid=26202162 #FOAvip Twit Text # Free Paper on # # # # # LINK http://www.kidney.de/pget.php?&tw=1&pmid=26202162 #FOAvip English Wikipedia <ref>{{Cite pmid|26202162 }}</ref> Handling trial participants with missing outcome data when conducting a meta-analysis: a systematic survey of proposed approaches #MMPMID26202162 Akl EA ; Kahale LA ; Agoritsas T ; Brignardello-Petersen R ; Busse JW ; Carrasco-Labra A ; Ebrahim S ; Johnston BC ; Neumann I ; Sola I ; Sun X ; Vandvik P ; Zhang Y ; Alonso-Coello P ; Guyatt G Syst Rev 2015[Jul]; 4 (ä): 98 PMID26202162 show ga BACKGROUND: When potentially associated with the likelihood of outcome, missing participant data represents a serious potential source of bias in randomized trials. Authors of systematic reviews frequently face this problem when conducting meta-analyses. The objective of this study is to conduct a systematic survey of the relevant literature to identify proposed approaches for how systematic review authors should handle missing participant data when conducting a meta-analysis. METHODS: We searched MEDLINE and the Cochrane Methodology register from inception to August 2014. We included papers that devoted at least two paragraphs to discuss a relevant approach for missing data. Five pairs of reviewers, working independently and in duplicate, selected relevant papers. One reviewer abstracted data from included papers and a second reviewer verified them. We summarized the results narratively. RESULTS: Of 9,138 identified citations, we included 11 eligible papers. Four proposed general approaches for handling dichotomous outcomes, and all recommended a complete case analysis as the primary analysis and additional sensitivity analyses using the following imputation methods: based on reasons for missingness (n?=?3), relative to risk among followed up (n?=?3), best-case scenario (n?=?2), and worst-case scenario (n?=?3). Three of these approaches suggested taking uncertainty into account. Two papers proposed general approaches for handling continuous outcomes, and both proposed a complete case analysis as the reference analysis and the following imputation methods as sensitivity analyses: based on reasons for missingness (n?=?2), based on the mean observed in the same trial or other trials (n?=?1), and based on informative missingness differences in means (n?=?1). The remaining eligible papers did not propose general approaches but addressed specific statistical issues. CONCLUSIONS: All proposed approaches for handling missing participant data recommend conducting a complete case analysis for the primary analysis and some form of sensitivity analysis to evaluate robustness of results. Although these approaches require further testing, they may guide review authors in addressing missing participant data. |*Bias [MESH] |*Data Accuracy [MESH] |*Meta-Analysis as Topic [MESH] |*Patient Dropouts [MESH] |Humans [MESH] |Research Design/*statistics & numerical data [MESH]Handling trial participants with missing outcome data when conducting (epmc).pdf DeepDyve Pubget Overpricing