in a small town in New York, we initiated a cohort study and followed 5,900 people for a mean follow-up of 2 years. At the end of the 2nd year, none of the participants was lost to follow-up. During this follow-up, we identified 600 cases of malaria. What was the cumulative incidence?
|
10.1% |
||
|
10.1 per 1,000 |
||
|
50.8% |
||
|
10 cases |
Correct option:
10.1%
Explanation:
Cumulative Incidence = Number of new cases of disease/ Total number of individuals in the population at risk for a specific time interval
= 600/5900
= 0.101695
= 10.1%
in a small town in New York, we initiated a cohort study and followed 5,900 people...
6,750 people who were free of disease X were enrolled in a cohort study in 1985 and followed with annual exams and interviews through 1995. Exposure to factor A was determined at study enrollment and the participants were followed until 1995 to observe new cases of disease X. Data from the study at the end of follow-up are shown in the following table. What is the incidence rate of disease X among persons exposed to factor A? Exposure to Factor...
An investigator initiated a clinic-based cohort study in 1997 to investigate factors associated with HIV seroconversion in a population-based sample of n=489 adults between 35-60 years old. The study was launched on January 1, 1997 and participants were asked to return for follow-up visits on a yearly basis. - at the baseline visit, n=43 participants tested HIV-seropositive among the sample of 489. - at the first follow-up visit, beginning in January 1, 1998, among those who were HIV-seronegative at baseline,...
We followed 25,000 people for 4yrs. Assume there were no losses to follow-up. During this follow-up 200 new cases were diagnosed.What was the total person- time follow up and incidence density?
Researchers enrolled 2,100 women in a study and followed them every year for four years to determine the incidence rate of heart disease. After the first year, none had a new diagnosis of heart disease, but 150 were lost to follow-up. After year two, three had a new diagnosis of heart disease, and another 122 had been lost to follow-up. After year three, another eighteen had new diagnoses of heart disease, and 602 had been lost to follow-up. After four...
2.94 points QUESTION 11 This measure shows how the observed mortality in a population compares to expectations: age-specific rate cause-specific rate proportional mortality ratio standardized mortality ratio 2.94 points QUESTION 12 33% of deaths among 44-65 years olds were due to drug overdose is an example of a: age-specific rate cause-specific rate proportional mortality ratio standardized mortality ratio 2.94 points QUESTION 13 In 2017, there were 300 deaths per 100,000 people aged 25-34 years in Rhode Island....
What was the cumulative incidence of HIV among study participants in January 2003? What was the cumulative incidence of HIV among study participants in January 2003? In January 2000, 5000 men and women aged 18-30 years were recruited from a semi-urban area near Durban (South Africa) and assessed for human immunodeficiency virus (HIV). Participants who did not test positive for HIV, at baseline in 2000, were followed-up and assessed again 3 years later in January 2003 (only those who previously...
We conducted a 2-year retrospective cohort study among all elderly members of a staff-model managed care organization who had a baseline diagnosis of chronic lung disease. The study outcomes were assessed over 2 years, from November 15, 1993, through November 14, 1995, and included hospitalizations for pneumonia and influenza. Of 1898 subjects, 1280 (67%) had received pneumococcal vaccination. This included 843 (44%) who were vaccinated prior to November 15, 1993 and an additional 437 (23%) vaccinated after that date. During...
What is the total person-time at risk over the 3 years (2000 to 2003)? What was the cumulative incidence of HIV among study participants in January 2003? In January 2000, 5000 men and women aged 18-30 years were recruited from a semi-urban area near Durban (South Africa) and assessed for human immunodeficiency virus (HIV). Participants who did not test positive for HIV, at baseline in 2000, were followed-up and assessed again 3 years later in January 2003 (only those who...
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....