Table 3.
Comparison of methodologic considerations between drinking water risk assessment models and intervention trials.
| Methodologic considerations | Risk assessment | Intervention trials |
|---|---|---|
| Sensitivity | Not relevant | Low |
| Causal evidence | Indirect | Direct |
| Pathogen inclusion | Few | Many |
| Model specification | Adds uncertainty | Not relevant |
| Transmission processes | Can be includeda | Only in a limited way |
| Distribution system effects | Can be includeda | Was included |
| Examining alternative control strategies | Yes | No |
| Expense | Low | High |
| Time | Fast | Slow |
a
Not included in this study.