(7) Distinguishing between causal and non

Question 1

What is a cause?

Answer 1

A factor that is associated with the disease so that if the intensity or prevalence of the factor in the population is changed, the incidence of disease also changes

Question 2

What is the triad model?

Answer 2

The idea that there are three factors which play a part in the infection of a person:
1) The host
2) The infectious agent
3) The environment
Changes to any of these affects the likelyhood of developing an illness

Question 3

What is a web of causality?

Answer 3

The idea that there is no single cause for a disease but multiple factors that interact with each other. It is hard to remove the causing factors and these factors may stimulate the occurence of new factors

Question 4

What is association and its types?

Answer 4

Association is hoe the level of one variable differes according to the level of another.
They may be:
Causal - The level of one variable changes according to another
Non causal - Due to chance, bias or confounding