historical control group


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historical control group

In a research study, a person or group of persons who were treated in the past and who provide contrast and comparison to participants currently being studied. Because a wide variety of variables may change over time, the use of historical controls as opposed to a contemporary control group is often an indication that an investigation has less methodological rigor.
See also: group
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0 to calculate independent samples nonparametric t tests (Mann-Whitney U), we examined mean differences between the FWPE/OTS scores of the historical control group and the simulation group.
High-fidelity simulation in occupational therapy curriculum: impact on level II fieldwork performance
5%) of the rates of rebleeding between the patients in this study (1/30) and the first historical control group [comprising 80 patients with hyphema treated with oral placebo at our department (26/80)] demonstrated statistically significant differences.
Comparison between topical and oral tranexamic acid in management of traumatic hyphema
11 The current study evaluated its effectiveness on 188 newborns with severe indirect hyperbilirubinaemia and compared it to a historical control group consisting of 177 neonates treated with conventional phototherapy.
The role of intensive phototherapy in decreasing the need for exchange transfusion in neonatal jaundice
The study compared the outcomes of trials for the same treatments and found that 79% of clinical trials with a historical control group showed a benefit over control, while only 20% of trials with a direct control group showed a benefit over control.
Study design: don't ruin a perfectly good product with a perfectly flawed study design
This study examines the rate of late-preterm birth in a hypnosis group (directed to all women) and a historical control group.
Preterm Labour and Clinical Hypnosis
Also, comparison of mortality with a historical control group is biased, as general treatment of ARDS has changed substantially in the last decade.
Does a new miniature ECMO system support gas exchange?

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