the degree to which a test result will change the odds that a patient has a disease. The likelihood ratio for a positive test expresses the degree to which the odds that a patient has a disease increase following a positive test. The likelihood ratio for a negative test expresses the degree to which the odds that a patient has a disease decrease following a negative test. Likelihood ratios depend on the *sensitivity and specificity of the test.
An indicator used in population studies to measure the portion of the population which is economically dependent on active age groups. It is calculated as the sum of the 0-14 year-olds and the over 60 or 65 year-olds, depending on the working age limit considered, divided by the number of people aged between 15 and 59 or 64, respectively.... dependency ratio
The value obtained by dividing one quantity by another: a general term of which rate, proportion, percentage, etc. are subsets. A ratio is an expression of the relationship between a numerator and a denominator where the two usually are separate and distinct quantities, neither being included in the other.... ratio
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