Hygiene Atlas

Atlas · Plate XIX · Community Health and Research · 03

Epidemiology

Epidemiology describes how disease moves through a population, framed by the triangle of host, agent and environment. Prevalence counts all existing cases at one time, while incidence counts new cases over a period. In the US about 42% of adults 30 and older have periodontitis, and about 1 in 4 adults has untreated decay.

High-yield facts · 5

  1. About 42% of US adults 30 and older have periodontitis; about 8% have severe periodontitis (NHANES 2009-2014).S58
  2. About 1 in 4 US adults has untreated tooth decay.S58
  3. Prevalence = all existing cases at one time / population; incidence = new cases over a period / population at risk.T9
  4. Morbidity is illness rate; mortality is death rate.T9
  5. Endemic: usual level in a population; epidemic: more than expected; pandemic: worldwide spread.T9

Facts are written in our own words; each tag links to its source. Values marked "sources vary" differ between references, so check the one your program uses.