Biostatistics - Medicinequizzes.com

Welcome to your Biostatistics

A group of 100 people diagnosed with liver cancer were questioned about their alcohol consumption within the previous 15 years. 60% were people with regular consumption of alcohol, 20% were social drinkers and the rest no drinkers. This group was compared to another group of the same amount of people with no liver cancer. Here 30% were regular drinkers, 15% social drinkers and the rest no drinkers. Which of the following studies describe this study the best?

Prospective Cohort

Case-Control

Retrospective Cohort

Cross-sectional

None of them

Which of the following statements is true?

A bimodal distribution in a date set is indicative for at least two populations

Both, positive and negative skews of data sets are classified as nonnormal distribution

In a xy graph, the mean is the larger compared to the median and mode in a positive skrew distribution

All of them are true

In a group of people with each subject having a unique height, meaning there is no other with the same height, there is no mode value

Two groups of 50 people between 50 and 60 years of age each are part of a study regarding their risk of developing myocardial infarction in the next 10 years. Group A consists of physically active people having at least three training sessions of more than 30 minutes a week. Group B instead live a sedentary life with no or one training session a week of less than 30 minutes. Within the 10 years, 5 people in group A and 15 people of Group B developed myocardial infarction. Which of the following studies describe this study the best?

Case-Control study

Retrospective cohort study

Prospective cohort study

Cross-sectional study

None of them

A new test was developed to detect aneurysm development of 100 people with a sensitivity of 30% and a specificity of 60%. The disease has a prevalence of 70%.

False negative: 31

True positive: 21

True negative: 12

False positive: 69

All of them are correct

A screening test with a sensitivity of 60% and a specificity 70% of was developed for an emerging pandemic with a prevalence of 80%. What is the positive predictive value?

6,78

1,17

5,78

2,93

30 People on the street were asked whether they regularly drink alcohol or not, meaning at least two drinks for man and one for women. 40% drank alcohol regularly. 5% stated that they have liver disease. Which of the following studies would describe this the best?

Prospective Cohort

Cross-sectional

Case-Control

None of them

Retrospective Cohort

In a study, the systolic blood pressure of 10 people was measured. The results were as follows: 80, 100, 90, 150, 130, 125, 100, 86, 154, 180. Which of the following statements is not correct?

The mode is 100

The mean systolic blood pressure is 119.5

The median systolic blood pressure is 112.5

None of them are correct

All of them are correct

Which of the following statement is correct?

Dividing the number of people that have developed disease X within the timespan Y by the number of people that are in risk for developing disease X in the same timespan Y would result in the incidence rate

Dividing the number of people that were diagnosed for disease X by timepoint Y by the number of people that already have the disease X in the same timepoint Y would result in the prevalence rate

Dividing the number of people that were diagnosed for disease X by timepoint Y by the total population in the same timepoint Y would result in the prevalence

All of them are true

None of them are true

In a retrospective cohort study consisting of two groups with each 50 people, the effect of Exposure A was studied regarding the dependency of development of disease A within the previous 6 years. The results are like this. Which of the following statements are not correct?

None of them are correct

All of them are correct

The low number of people having the disease relative to the total number in each group allow the odds ratio to be used for risk quantification according to the principals of rare disease assumption

The odds ratio is 1,27

10.

Which of the following statements are true?

All of them are true

In diseases that are rare in exposed as well as in unexposed people, the relative risk ratio draws close to the odds ratio

The relative risk of a particular exposure to a disease is calculated by dividing the number of people having the disease and have been exposed by the number of people not having the disease while being exposed divided by the number of people having the disease and have not been exposed by the number of people not having the disease while not being exposed.

The preferred way of risk quantification in a cohort study is the calculation of relative risk

The preferred way of risk quantification in a case-control study is the calculation of the odds ratio

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