In a county that does not require measles vaccination, a school experienced a prolonged measles outbreak among its students in the beginning of the semester to the end of the semester. To calculate the cumulative incidence or risk of measles among students, which denominator should you use?
The number of susceptible students at the end of the period
The number of susceptible students at the midpoint of the period
The number of susceptible students at the beginning of the period
The average number of susceptible students during the outbreak
To calculate the cumulative incidence or risk of measles akong students, the denominator that should be used is
The average number of susceptible students during the outbreak.
This is so because if we calculate number of students at any particular point of the outbreak (beginning, midpoint, end) we might get a biased estimate. Whereas, the average number of students susceptible during the outbreak gives us an unbiased estimate.
In a county that does not require measles vaccination, a school experienced a prolonged measles outbreak among its students in the beginning of the semester to the end of the semester. To calculate th...
The data of a major referral hospital showed that most patients with ischemic heart disease (IHD) were black American. Based on this, it was concluded that black Americans are at higher risk of IHD compared to other community groups. How would you describe the conclusion? A. Correct, because risk factors for IHD are more common in black African American. B. Incorrect, because no test of statistical significance has been made C. Incorrect, because prevalence is used instead of incidence D....
The data of a major referral hospital showed that most patients with ischemic heart disease (IHD) were black American. Based on this, it was concluded that black Americans are at higher risk of IHD compared to other community groups. How would you describe the conclusion? A. Correct, because risk factors for IHD are more common in black African American. B. Incorrect, because no test of statistical significance has been made C. Incorrect, because prevalence is used instead of incidence D....