The phrase "estimated level" refers to an approximate or calculated amount or degree of something. It is a guess or estimation rather than an exact measurement or value. Full definition
The researchers used that information to estimate the levels of certain potentially cancer - promoting chemicals in the men's diets. (criticalillnessinsuranceinfo.org)
Their exposure to air pollution over the same period was calculated on the basis of estimated levels on the shortest walking route to their school. (sciencedaily.com)
By comparing this information to the patterns in hundreds of thousands of past credit reports, FICO ® Scores estimate your level of future credit risk. (myfico.com)