How to determine which type of sample size calculation method on GPower or other calculator for this cross sectional study?
Qs: Does better knowledge and use of sublingual GTN improve Quality of life in patients post acute MI.
Objectives:
1. To determine the knowledge and use of sublingual GTN among acute post MI patients
2. The determine the factors that are associated with the knowledge and use of sublingual GTN
3.The association between the knowledge and use of sublingual GTN and Quality of life in patients post acute MI.
Sociodemographic factors are Nominal and Ordinal variables
Knowledge and use of SLGTN are both nominal and ordinal variables.
Quality of Life is quantitative variable
Thank you.
It depends on whether your cross-sectional study is descriptive or analytical. For both types, Wang and Cheng (2020) have provided good insights. Here is the full citation.
Wang, X., & Cheng, Z. (2020). Cross-sectional studies: Strengths, weaknesses, and recommendations. Chest, 158(1), S65–S71. https://doi.org/10.1016/j.chest.2020.03.012
Good luck,
It depends... but in a easy way there is a standard path to create a sample.
In part depends of your population and the confidence interval that we want (with no less of 0.95 it's OK, and I recommend you this.).
You can use this formula:
- x = sample
- N = No. of population
- Standard deviation = SD = if you don't know we can use a SD equal to 0.25
- We'll use a confidence interval of 0.95. That means = Z*(2/0.05) = 1.96
- e = margin of error = 0.05
x =(N*(SD^2)*(Z*(2/0.05))^2) / (e^2*(N-1)+SD^2*(Z*(2/0.05))^2)
...therefore:
x = (N* (0.25^2) * 1.96^2) / (0.05^2 * (N-1) + 0.25^2 * 1.96 ^2)
Hope you do well!
I recommended sample size calculation a priori
https://www.danielsoper.com/statcalc/default.aspx
Mohialdeen Alotumi Fabian A. Bloomfield Cristian Ramos-Vera thank you very much for the help. Will explore into the recommendations!
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