Should I be considering the results from a study that just states percentages but didn't do any statistical analysis? I have a question regarding results from a study and it's probably a very basic question (but I only have a very very basic understanding of epidemiology). I'm looking at what characteristics have a significant association with an outcome from multiple studies, so I have generally looked at results that were found to be significantly associated with the outcome through statistical analysis (regression analysis mostly and some studies used odds ratio). However, I found a study that just states percentages and says there is an association. I'm a little bit wary of taking those results. I've looked in the methods but it does not say anything except that it conducted an analysis using StatSoft Statistica 13.1. So I'm not sure if I should be considering this?
Edit: The study also mentions the number of cases examined and provides n (%) for the study. In case anyone is wondering what the study looks like, here is a link: https://doi.org/10.3390/vaccines9050475
Edit: My main issue is that the study uses summary statistics and there is no statistical significance to the results, and that is why I was wondering if I should even be considering these results because of that.

It seems that the paper in question didn't report statistical significance of the results, but you can use the formula for the standard error of a binomial proportion estimate to help evaluate the results. From this page, for example, the standard error of a binomial proportion estimate $\hat p$ based on an overall sample size $n$ can be taken as $\sqrt{\hat p(1-\hat p)/n}$. With a sample size of 419, as reported by the paper, that would correspond to about 0.014 standard error in an estimated proportion of 0.1, to a maximum standard error of about 0.024 in an estimated proportion of 0.5.
There are several detailed approaches for how to use that relationship to evaluate signficance statistically; see this Wikipedia page for example.
