Methods for Reducing the Number of People with a Disadvantageous Condition
| Existential methods for reducing the number of persons with disadvantageous condition C | |
| (1) Preventing the existence of such persons. | Contraception; abortion |
| (2) Ending the existence of such persons. | Voluntary or involuntary killing or letting die |
| Non-existential methods for reducing the number of persons with disadvantageous condition C | |
| (3) Preventing the emergence of condition C. | Social/biomedical interventions that prevent C |
| (4) Reversing the emergence of condition C. | Social/biomedical interventions that reverse C |