In the Atlantis TB data, the number 264 on June 30, 2003 represents which measure?

In the Atlantis TB data, the number 264 on June 30, 2003 represents which measure?

• A. Incidence during the six months
• B. Cumulative incidence
• C. Prevalence at a point in time
• D. Mortality count

Answer: (C)

Point prevalence is the number of people who have the disease at a specific date. The figure 264 on June 30, 2003 in the Atlantis TB data is a snapshot of everyone currently living with TB on that day, regardless of when they were diagnosed. It is not counting new cases that appeared during a window (incidence), nor is it the probability of developing TB over a period (cumulative incidence). It also isn’t a tally of deaths (mortality count). So this number represents the point prevalence—the count of existing TB cases on that single date.

Point prevalence is the number of people who have the disease at a specific date. The figure 264 on June 30, 2003 in the Atlantis TB data is a snapshot of everyone currently living with TB on that day, regardless of when they were diagnosed. It is not counting new cases that appeared during a window (incidence), nor is it the probability of developing TB over a period (cumulative incidence). It also isn’t a tally of deaths (mortality count). So this number represents the point prevalence—the count of existing TB cases on that single date.