Question

- Use the bathtub or water fall analogy to explain incidence and prevalence. Include factors that affect prevalence rising and falling

Answer 1

INCIDENCE AND PREVALENCE

Bathtub : incidence is water going in the spigot, prevalence is sitting water in the tub, bathtub is community , and the drain is those who diminishing or leaving the community

Waterfall: incidence is the water flowing down the cascade, prevalence is the collecting water at the base.
Incidence not be mistaken for prevalence, which is the extent of cases in the populace at a given time as opposed to incidence of event of new cases. Along these lines, incidence passes on data about the danger of getting the sickness, while prevalence shows how across the board the illness is. Prevalence is the extent of the aggregate number of cases to the aggregate populace and is increasingly a proportion of the weight of the ailment on society with no respect to time in danger or when subjects may have been presented to a conceivable hazard factor. Prevalence can likewise be estimated concerning a particular subgroup of a populace . Incidence is generally more valuable than prevalence in understanding the ailment etiology: for instance, if the rate of an infection in a populace expands, at that point there is a hazard factor that advances the rate.
Prevalent proportion are expanded by

1) immigration of cases or those with a high potential to end up cases (elderly)
2) emigration of healthy people
3) increments in the span of the malady (prior discovery, better treatment, decreased casualty, and so on.)
4) Increments in frequency (event of new cases) Prevalent proportion are diminished by

1) Immigration of healthy people
2) Emigration of people with infection
3) Improved cure rates
4) increment passing/death rates
5) Decreases in rate (event of new cases)
6) Shorter duration of the illness