I don't think it's looked at systematically by government in analyzing trends. It's certainly looked at by researchers and has been over a long period of time—looking at gender for example. The seniority of people is considered. What enables some whistle-blowers to survive in situations where others don't? Their employment basis, seniority, and level of experience are clearly factors. Gender is sometimes a factor. That's part of the purpose of the research that many of us are involved in, rather than necessarily currently a direct focus in the statistics that are collected officially by the agencies. Definitely one of the reasons why the oversight agencies invest in our research process is to find out that sort of information. Where should the efforts be targeted? Who's most at risk? What causes those risks and how can those risks be responded to most effectively?
On April 3rd, 2017. See this statement in context.