PUBH 8035 Epidemiology: Decoding The Science of Public Health/ PUBH 8035 Module 6 complete solution

Question: The main purpose of screening is to identify symptomatic disease using tests, exams, or other procedures Question: The detectable preclinical phase of a disease starts when the disease can … by a screening test and ends when the disease produces symptoms Question: Diseases that are appropriate for screening… Question: Use the following information to answer questions 4-8. Suppose that 50,000 women who have never had a breast cancer diagnosis are available and willing to participate in a new screening program of … digital mammography. 1132 women had a positive screening test. All of these positive women had a breast biopsy and 136 were diagnosed with breast cancer. Of the 48,868 who … “negative” on the test, 24 were in fact in the detectable pre-clinical phase. This was … by following these women and observing that all 24 were diagnosed with breast cancer within one year of the screening test. What is the prevalence of the detectable pre-clinical phase of breast cancer in this population? Question: Use the following information to answer questions 4-8. Suppose that 50,000 women who have never had a breast cancer diagnosis are available and willing to participate in a new screening program of … digital mammography. 1132 women had a positive screening test. All of these positive women had a breast biopsy and 136 were … with breast cancer. Of the 48,868 who … “negative” on the test, 24 were in fact in the detectable pre-clinical phase. This was … by following these women and observing that all 24 were … with breast cancer within one year of the screening test. What is the sensitivity of this new screening test Question: Use the following information to answer questions 4-8. Suppose that 50,000 women who have never had a breast cancer diagnosis are available and willing to participate in a new screening program of … digital 1132 women had a positive screening test. All of these positive women had a breast biopsy and 136 were … with breast cancer. Of the 48,868 who … “negative” on the test, 24 were in fact in the detectable pre-clinical phase. This was … by following these women and observing that all 24 were … with breast cancer within one year of the screening test. What is the specificity of this new screening test? Question: Use the following information to answer questions 4-8. Suppose that 50,000 women who have never had a breast cancer diagnosis are available and willing to participate in a new screening program of computerized digital mammography. 1132 women had a positive screening test. All of these positive women had a breast biopsy and 136 were diagnosed with breast cancer. Of the 48,868 who screened “negative” on the test, 24 were in fact in the detectable pre-clinical phase. This was … by following these women and observing that all 24 were … with breast cancer within one year of the screening test. What is the predictive value of a positive test result for this new screening test? Question: Use the following information to answer questions 4-Suppose that 50,000 women who have never had a breast cancer diagnosis are available and willing to participate in a new screening program of … digital mammography. 1132 women had a positive screening test. All of these positive women had a breast biopsy and 136 were … with breast cancer. Of the 48,868 who … “negative” on the test, 24 were in fact in the detectable pre-clinical phase. This was … by following these women and observing the at all 24 were … with breast cancer within one year of the screening test. A colleague in another city reports that the same screening test (with the same sensitivity and specificity) is achieving a predictive value positive of only 6%. What is the explanation for this? Question: Lead time bias makes it erroneously appear that survival is better for … cases. Question: Length bias occurs because fast growing tumors are more likely to … up by a screening test than are slow growing tumors. Question: What is the correct interpretation of the results of a calculation of specificity for a screening test of 97%? Question: The difference between primary and secondary prevention of disease is: Question: Sensitivity refers to the ability of a screening test to identify correctly all … individuals who have a disease. Question: Sensitivity and specificity of a screening test refer to its: Question: If the same screening test is … in two populations, one with a high prevalence of the disease and one with a low prevalence of the disease, assuming the sensitivity and specificity of the screening test are the same, which of the following Statements about positive predictive value (PPV)applies: