Study design
In this study, a double-blind, randomized controlled trial was conducted to assess the effects of aroma seals on adult participants. The study was conducted between November 11, 2021, and December 20, 2021. The participants were informed in advance about the study’s objectives and methods, and written informed consent was obtained. This study was approved by the Research Ethics Committee of Hoshi University (approval no. 2021–15). The study protocol was pre-registered at the University Hospital Medical Information Network Center prior to the initiation of the study (UMIN trial ID: UMIN000045941, first registered 01/11/2021). This report is from “The effectiveness of using an aroma seal for stress relief when wearing a mask: a parallel group comparison test” of the study. All study methods were performed in accordance with the relevant guidelines and regulations.