You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Calculate the specificity of the screening test:\r\n \r\n \r\n\r\n\r\n\r\nScreening test results\r\n\r\n\r\nDiseased\r\n\r\nNot diseased\r\nTotal\r\n\r\n\r\n\r\nPositive\r\n\r\n\r\n400\r\n\r\n\r\n200\r\n\r\n\r\n600\r\n\r\n\r\n\r\n\r\nNegative\r\n\r\n\r\n100\r\n\r\n\r\n600\r\n\r\n\r\n700\r\n\r\n\r\n\r\n\r\nTotal\r\n\r\n\r\n500\r\n\r\n\r\n800\r\n\r\n\r\n1300\r\n\r\n\r\n\r\n and explain in detail?
Specificity is the ability of a test to identify correctly those who do not have the disease, that is, the percentage of "true negatives" among those not diseased. In the above question, there are 600 true negatives among 800 who are not diseased. Hence, the specificity is (600/800)x100 = 75 per cent. Ref: Park's Textbook Of Preventive And Social Medicine, By K. Park, 19th Edition, Pages 118, 119.