I am curious if it is acceptable to write another article based on the analysis that has already been included in the supporting information that was published together with a peer-reviewed article online.
FYI: The supporting information was available online only but open-access. The analysis includes descriptives, models, and a few paragraphs summarizing the model output (no literature review, methodology, discussions, conclusions, etc.) The new article is about a brand new topic that was not discussed in the article that has already been published. I put the analysis into the supporting information because the reviewer/editor wanted a "full analysis of any variables that have been used" but then they thought the article is too long and asked me to throw the less/non-relevant model outputs into the supporting information. It is such a pity that the data and analysis could make a greater influence if published as an independent article so I wonder if it is possible to make use of the supporting information/appendix and write another article. Of course, I don't want to get myself into the trouble of self-plagiarism...
Any idea?