What are the 5 principles of epidemiology?

The 5 principles of epidemiology are:

1. The health event, condition, or risk factor must be measurable.
2. The frequency of the event, condition, or risk factor must be measurable in the population.
3. The event, condition, or risk factor must be linked to a specific population.
4. There must be a temporal relationship between the event, condition, or risk factor and the disease or outcome.
5. The relationship between the event, condition, or risk factor and the disease or outcome must be causal.