The statistics section includes the description “independent t-tests”. Several such tests have, however, been developed, e.g. Student’s, Satterthwaite’s, Prien’s, etc. Which one was used here?
What does “statistically different” mean? Please clarify.
Univariate – multivariate
The term multivariate is used incorrectly, see e.g. Hidalgo B, Goodman M. Multivariate or multivariable regression? Am J Public Health 2013;103:1-3.
Four quartiles are presented. According to the statistical terminology (see The International Statistical Institute. The Oxford Dictionary of Statistical Terms. Oxford University Press, New York 2003) only 3 quartiles exist, the middle one also being the median.