I am writing a paper about whether in the United States, referees in my sport are biased towards players with certain attributes.
I am also employed as a referee in this sport and have credentials from the American association for the sport. However, I am at a lower level than the referees in the dataset and I was not employed during the timeframe that the data looks at. Additionally, I am only employed as a contractor, and referee less than 20 days a year. My involvement as a referee did not impact at all how I did the research, besides giving me a better understanding of the sport.
Do I need to report this as a conflict of interest?