Also, the biology majors tend to be the biggest group of science majors at most schools*, so lumping all sciences together will often get biology-biased data, which may end up being misleading, especially in comparison to schools where biology tends to be less popular relative to other sciences.
- http://nces.ed.gov/programs/digest/d13/tables/dt13_322.10.asp lists 95,849 bachelor's degrees in biological and biomedical sciences for 2011-2012, but only 26,663 in physical sciences and science technologies.