Guidelines Sheet 1 allows you to complete a 2x2 contingency table and will give values of prevalence, sensitivity, specificity, LR+, LR-, an Sheet 2 allows you to give a population size, prevalence, sensitivity and specificity, and will then populate the table and calcu Grey boxes indicate where numbers can be inserted Group sizes are in whole numbers; results are expressed as proportions not percentages Some rounding is used in sheet 2 which may give slightly inconsistent appearing results at times; at most the error should be sensitivity, specificity, LR+, LR-, and OR then populate the table and calculate the other statistics mes; at most the error should be 1 in any group Results from a contingency table Condition Positive Negative Positive 0 Test Negative 0 0 0 0 Prevalence: #DIV/0! Sensitivity: #DIV/0! Specificity: #DIV/0! PPV: #DIV/0! NPV: #DIV/0! Positive LR: #DIV/0! Negative LR: #DIV/0! OR #DIV/0! Results from a prevalence Condition Positive Negative Positive 0 0 0 Test Negative 0 0 0 0 0 Prevalence: Sensitivity: Specificity: PPV: #DIV/0! NPV: #DIV/0! Positive LR: 0.00 Negative LR: #DIV/0! OR #DIV/0!
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