# Sensitivity and Specificity

Not what you're looking for?

Hypertension

As part of a study performed in Norway, 70,000 people in the general population had their blood pressure measured; two readings were obtained and the second reading was used in the analysis. The people were followed for mortality outcome over a 10-year period after the blood-pressure measurement using death files in the Norwegian Central Bureau of Statistics. The results shown below were obtained from the subgroup of 5,034 men ages 50-59 at baseline:

10-year Mortality Outcome

DBP (mm Hg) Dead Alive Total

100+ 124 295 419

<=99 764 3,851 4,615

Total 888 4,146 5,034

1. If we regard a diastolic blood pressure of >=100 mm Hg as a screening test for predicting mortality over the next 10 years, then what is the sensitivity of the test?

2. What is the specificity of the test?

3. If the subjects in the study sample are considered representative of the general population, then what is the predictive value positive and negative of the test?

4. Suppose the threshold for positivity were changed from 100+ to 95+. Would the sensitivity and specificity increase, decrease, or remain the same?

##### Purchase this Solution

##### Solution Summary

Sensitivity and specificity is examined.

##### Solution Preview

Hypertension

As part of a study performed in Norway, 70,000 people in the general population had their blood pressure measured; two readings were obtained and the second reading was used in the analysis. The people were followed for mortality outcome over a 10-year period after the blood-pressure measurement using death files in the Norwegian Central Bureau of Statistics. The results shown below were obtained from the subgroup of 5,034 men ages ...

##### Purchase this Solution

##### Free BrainMass Quizzes

##### Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

##### Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

##### Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

##### Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.