The bulk of attrition comes in engineering and among pre-med majors, who typically leave STEM fields if their hopes for medical school fade. I don't know that

The bulk of attrition comes in engineering and among pre-med majors, who typically leave STEM fields if their hopes for medical school fade. I don't know that including pre-meds in the analysis is worthwhile. While medicine is certainly quite technical, I don't really consider it a STEM field. The economic multipliers from improved medicine (increasing productivity for each of a doctor's patients) is qualitatively different from those for "real" STEM fields (increasing productivity for potentially anyone who can get the discovered knowledge).