An institutional review board (IRB) approved a study. I wrote a paper reporting results from the study. Do I need to mention in the paper that an IRB approved this study?
It depends on the journal. For example, the Journal of Multicultural Counseling and Development instructions for authors state:
appropriate institutional review board (IRB) review and approval should accompany all studies involving human participants or research material derived from human participants. This information should be clearly stated in the Method section of the manuscript. In addition, the manner in which informed consent was obtained from the study participants (i.e., oral, written, online/electronic) should also be stated in the Method section. If the study was exempted from IRB approval, that information should be indicated in the Method section. Failure to provide this information in the manuscript may result in the manuscript being returned without review.
Nature takes a different approach and does not require the IRB approval to be mentioned in the text (and may not even allow it), but does provide a checklist, that the author must complete and is provide to reviewers, that deals with IRB approval.