Fig. 1
From: A dataset of laymen olfactory perception for 74 mono-molecular odors

Overview of the study design and procedures. The study has been conducted in Germany and in the German language only, instructions and scales are presented in English here for better readability. First, all participants filled in questionnaires using an online survey implemented via LimeSurvey. Then, participants were assigned to one out of nine odor sets, containing a subset of ten out of the total 74 mono-molecular odors. The odor samples were provided in small plastic containers. Two “anchor odors” were used in all odor sets for comparison between groups, the other eight odors differed between groups. The participants first gave a free description for each odor (in German) and then evaluated them again using eight visual analogue scales and 16 further qualitative labels obtained from Keller & Vosshall10. The labels from Keller & Vosshall were translated into German for the study, but are displayed in English in this figure. 875 participants for odor sets 1 to 7 (@home) performed the questionnaires and odor evaluation at home using a prepared test kit. 244 healthy participants and 48 patients for odor sets 8 and 9 (@lab) performed the odor evaluation on site at the laboratory facilities. Another 60 healthy participants were recruited for a retest study: Each smelled at a selection of six odors chosen based on interim results of data collection from the nine odor sets on two measurement occasions separated by approximately one week.