Intersection · Evidence × observational data

Evidence topics tagged observational data

Topics in Evidence carrying the tag observational data. Cohort, registry and claims data, with the confounding that comes with it.

20 topics

Topic	Participants	Replies	Views	Activity
A structured critique template this community uses — a second dataset observational data effect size confounding Solved On the subject in the title: A structured critique template this community uses — a second dataset Working notes rather than a conclusion. Session topic: SELECT ( N Engl J Med , 2023). Please read it before…	+47	51	16k	15h
A critique that turned out to be unfair, retracted by its author confounding risk of bias effect size observational data Wiki Posting this under the heading it deserves: A critique that turned out to be unfair, retracted by its author Everything below is what sits behind that. Session topic: SURMOUNT-4 ( JAMA , 2024). Please read it…	+34	38	20k	17h
Coming back to: A structured critique template this community uses confounding risk of bias disputed observational data Posting this under the heading it deserves: A structured critique template this community uses Everything below is what sits behind that. Comparing STEP 8 ( JAMA , 2022) with SURMOUNT-1 ( N Engl J Med , 2022)…	+63	69	17k	18h
A structured critique template this community uses observational data effect size risk of bias A structured critique template this community uses — setting out what I have, and where I think it stops being reliable. Comparing SURMOUNT-2 ( Lancet , 2023) with SURPASS-4 ( Lancet , 2021) and finding the…		2	18k	1d
Coming back to: Measurement error in a self-reported exposure risk of bias observational data effect size disputed Measurement error in a self-reported exposure — setting out what I have, and where I think it stops being reliable. I have seen FLOW ( N Engl J Med , 2024) cited in support of a claim I do not think it…	+23	27	49k	3mo
[2026 update] Confounding by indication, explained with a concrete example observational data disputed risk of bias Confounding by indication, explained with a concrete example Writing it up because I had to work it out twice and would rather nobody else did. I have seen SURPASS-4 ( Lancet , 2021) cited in support of a…	+103	116	22k	5mo
Measurement error in a self-reported exposure confounding risk of bias effect size disputed Solved Closed Posting this under the heading it deserves: Measurement error in a self-reported exposure Everything below is what sits behind that. Session topic: SURPASS-2 ( N Engl J Med , 2021). Please read it before…	+117	129	45k	5mo
Reverse causation in a cohort study of weight and outcome disputed observational data effect size On the subject in the title: Reverse causation in a cohort study of weight and outcome Working notes rather than a conclusion. Comparing SELECT ( N Engl J Med , 2023) with FLOW ( N Engl J Med , 2024) and…	+10	14	11k	7mo
Selection into a registry and what it does to the estimate risk of bias disputed observational data Selection into a registry and what it does to the estimate — setting out what I have, and where I think it stops being reliable. Session topic: STEP 4 ( JAMA , 2021). Please read it before posting; the…		2	55k	7mo
Critiquing an observational claim about a class effect — one year on observational data disputed risk of bias Pinned Critiquing an observational claim about a class effect — one year on — setting out what I have, and where I think it stops being reliable. I have seen LEADER ( N Engl J Med , 2016) cited in support of a claim…	+5	9	3.2k	8mo
Reverse causation in a cohort study of weight and outcome — a second dataset risk of bias observational data confounding Reverse causation in a cohort study of weight and outcome — a second dataset Writing it up because I had to work it out twice and would rather nobody else did. Session topic: SURMOUNT-OSA ( N Engl J Med ,…	+112	131	1.5k	10mo
Confounding by indication, explained with a concrete example confounding observational data disputed On the subject in the title: Confounding by indication, explained with a concrete example Working notes rather than a conclusion. Comparing SURMOUNT-1 ( N Engl J Med , 2022) with SURPASS-2 ( N Engl J Med ,…	+21	25	21k	11mo
Immortal time bias in a claims-database study risk of bias observational data disputed confounding Closed Immortal time bias in a claims-database study — setting out what I have, and where I think it stops being reliable. I have seen FLOW ( N Engl J Med , 2024) cited in support of a claim I do not think it…	+29	34	28k	11mo
A claim built entirely on a subgroup analysis risk of bias observational data confounding disputed Solved A claim built entirely on a subgroup analysis Writing it up because I had to work it out twice and would rather nobody else did. I have seen SUSTAIN 6 ( N Engl J Med , 2016) cited in support of a claim I do…	+71	80	1.1k	14mo
A well-designed study with a badly written abstract disputed effect size risk of bias observational data Posting this under the heading it deserves: A well-designed study with a badly written abstract Everything below is what sits behind that. Comparing SCALE ( N Engl J Med , 2015) with LEADER ( N Engl J Med ,…	+117	128	7.2k	14mo
Critiquing an observational claim about a class effect disputed risk of bias effect size observational data Posting this under the heading it deserves: Critiquing an observational claim about a class effect Everything below is what sits behind that. Session topic: SCALE ( N Engl J Med , 2015). Please read it before…		2	6.9k	14mo
Coming back to: A critique that turned out to be unfair, retracted by its author disputed observational data effect size confounding Closed A critique that turned out to be unfair, retracted by its author — setting out what I have, and where I think it stops being reliable. I have seen STEP 4 ( JAMA , 2021) cited in support of a claim I do not…		2	1.3k	14mo
Criticising the method without criticising the authors disputed observational data confounding effect size Criticising the method without criticising the authors Writing it up because I had to work it out twice and would rather nobody else did. I have seen STEP 1 ( N Engl J Med , 2021) cited in support of a claim…	+55	61	60k	15mo
About the Study critique category risk of bias confounding observational data Pinned Wiki Structured criticism of a specific published study. Criticise the method, not the author. This post is a community wiki: any member at trust level 3 or above can edit it, and every edit is recorded with its…		4	114	16mo
A claim built entirely on a subgroup analysis — what changed since disputed effect size observational data risk of bias Closed On the subject in the title: A claim built entirely on a subgroup analysis — what changed since Working notes rather than a conclusion. I have seen PIONEER 6 ( N Engl J Med , 2019) cited in support of a claim…		2	2k	18mo

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