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Pseudoreplication in physiology: More means less.

ABSTRACT: This article reviews how to analyze data from experiments designed to compare the cellular physiology of two or more groups of animals or people. This is commonly done by measuring data from several cells from each animal and using simple t tests or ANOVA to compare between groups. I use simulations to illustrate that this method can give erroneous positive results by assuming that the cells from each animal are independent of each other. This problem, which may be responsible for much of the lack of reproducibility in the literature, can be easily avoided by using a hierarchical, nested statistics approach.

SUBMITTER: Eisner DA

PROVIDER: S-EPMC7814346 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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Pseudoreplication in physiology: More means less.

Eisner David A DA

The Journal of general physiology 20210201 2

This article reviews how to analyze data from experiments designed to compare the cellular physiology of two or more groups of animals or people. This is commonly done by measuring data from several cells from each animal and using simple t tests or ANOVA to compare between groups. I use simulations to illustrate that this method can give erroneous positive results by assuming that the cells from each animal are independent of each other. This problem, which may be responsible for much of the la ...[more]

PMID: 33464305

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Project description:Implantable chemoport is a very useful device for long-term venous access for infusion of chemotherapeutic drugs and other agents. There are few studies from resource poor countries reporting complications of chemoport. The aim of the present study is to evaluate the feasibility of chemoport insertion without image guidance and by closed technique without direct visualisation of a major vein (mainly IJV) and to study the complications associated with the procedure. This was a prospective observational study which analysed 263 patients who underwent chemoport insertion. The medical records of these patients were analysed for the patient characteristics, diagnosis, port-related complications, and their management. A total of 263 patients who were harbouring either locoregionally advanced or metastatic tumour requiring either chemotherapy or targeted treatment or both were included in the study. In total, 133 (50.57%) were female patients and 130 were male patients (49.43%). A total of 236 patients (89.73%) underwent port insertion procedures under local anaesthesia. None of the patients had any major intra-operative complications. Postoperatively, 4 patients (1.52%) were found to have port catheter malposition; 3 out of this 4 were corrected under IITV guidance as a second procedure under local anaesthesia only. One patient (0.38%) required formal removal and replacement of port. Four patients (1.52%) developed IJV thrombosis requiring port removal and anti-coagulation. One patient (0.38%) developed thrombus in the right atrium. There were 2 port site infections (0.74%) requiring port removal (SSI cat. 5). Low complication rates of port insertion were observed in the present, large, prospective study. Complication rates may be further reduced by using a well-designed procedure, experienced surgeons, an aseptic environment, ultrasound-guided puncture, and fluoroscopy with contrast media.Supplementary informationThe online version contains supplementary material available at 10.1007/s13193-020-01265-6.

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Pseudoreplication in physiology: More means less.

Publications

Pseudoreplication in physiology: More means less.

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