Articles

Sample Size calculation based on research Approaches in Animal Studies

Abstract

Background: Sample sizes that are too small can produce inconclusive results, while sample sizes that are too large may raise ethical concerns and produce trivial outcomes.  Ethical considerations of sample size calculation in animal studies are essential and researchers should consider the 3R approach. Therefore, accurately calculating the sample size is essential to ensure adequate statistical power and avoid wastage of resources.

Method: The paper presents several innovative approaches for conducting small-scale sampling in animal studies. It includes a comprehensive review of relevant literature, discussing various proposed methods for determining sample size in animal studies.

Results: In this study, various formulas are available for preparing sample size calculations that are relevant to the research design. These include t-tests (for one sample and two independent/paired samples), ANOVA, ANCOVA, simple/multiple linear regression, as well as proportion studies and studies utilizing correlation coefficients.

Conclusions: Our aims to equip researchers with formulas for reliable findings and adherence to ethical principles for sample size calculating in animal studies.

1- Ko, M. J., & Lim, C. Y. (2021). General considerations for sample size estimation in animal study. Korean Journal of Anesthesiology, 74(1), 23-29. https://doi.org/10.4097/kja.20662
2- Suresh K, Chandrashekara S. (2012). Sample size estimation and power analysis for clinical research studies. J Hum Reprod Sci. Jan; 5(1):7-13. doi: 10.4103/0974-1208.97779. Retraction in: J Hum Reprod Sci. 2015 Jul-Sep; 8(3):186. PMID: 22870008; PMCID: PMC3409926.
3- Pakgohar, A. (2023). The Role of Sample Size on Interpretation of the Result in Applied Research A Study on the Analysis of Regression Models. Methodology of Social Sciences and Humanities, 29(114), 19-34.‏
4- Zhang, X., & Hartmann, P. (2023). How to calculate sample size in animal and human studies. Frontiers in Medicine, 10,1215927. https://doi.org/10.3389/fmed.2023.1215927
5- Pakgohar, A., & Khalili, M. (2021). Investigation of sample size in qualitative sampling methods. Popularization of Science, 12(1), 270-297. https://doi: 10.22034/popsci.2021.286809.1090
6- Wang, X., & Ji, X. (2020). Sample size estimation in clinical research. Annals of Translational Medicine, 8(6), 358. 1
7- Chow, S.-C., Shao, J., & Wang, H. (2020). Sample size calculations in clinical research (3rd ed.). CRC Press
8- Ricci C, Baumgartner J, Malan L, Smuts CM. (2020). Determining sample size adequacy for animal model studies in nutrition research: limits and ethical challenges of ordinary power calculation procedures. International Journal Food Science Nut. Mar; 71(2):256-264.
9- Schmidt SAJ, Lo S, Hollestein LM. (2018). Sample size estimation and power calculation. J Invest Dermatol. Aug; 138(8):1678-1682.
10- Festing MF, Altman DG. (2002). Guidelines for the design and statistical analysis of experiments using laboratory animals. ILAR J. 43:244–58. [PubMed: 12391400]
11- Charan, J., & Kantharia, N. D. (2013). How to calculate sample size in animal studies? Journal of Pharmacology & Pharmacotherapeutics, 4(4), 303-306. https://doi.org/10.4103/0976-500X.119726.
12- Festing MF. (2006). Design and statistical methods in studies using animal models of development. ILAR J. 47:5–14. [PubMed: 16391426]
13- Arifin WN, Zahiruddin WM. Sample size calculation in animal studies using resource equation approach. Malays J Med Sci. 2017;24(5):101–105. https://doi.org/10.21315/mjms2017.24.5.11.
14- Girden, E. R. (1992). ANOVA: Repeated measures (No. 84). sage.‏
15- Dell RB, Holleran S, Ramakrishnan R. (2002). Sample size determination. ILAR J. 43(4):207-13.
Files
IssueVol 9 No 4 (2023) QRcode
SectionArticles
DOI https://doi.org/10.18502/jbe.v9i4.16672
Keywords
Sample size Animal studies Effect size Ethical considerations Statistical power

Rights and permissions
Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
How to Cite
1.
Pakgohar A. Sample Size calculation based on research Approaches in Animal Studies. JBE. 2023;9(4):474- 483.