A cohort study is conducted to assess the association between clinical characteristics and the risk of stroke. The study involves n = 1370 participants who are free of stroke at the study start. Each participant is assessed at study start (baseline) and every year thereafter for 5 years. The following data were collected relating hypertensive status measured at baseline to incident stroke over 5 years.   Free of Stroke at 5 years Stroke Baseline: Not hypertensive 1000 50 Baseline: Hypertensive 300 520 Compute the cumulative incidence of stroke in patients classified as hypertensive at baseline.A)0.20B)0.50C)0.0625D)0.05 I followed the directions as shown in a similar question 20/70 patients with hypertension and stroke divided by patients with stroke however, I do not come up with a correct answer

A cohort study is conducted to assess the association between clinical characteristics and the risk of stroke. The study involves n = 1370 participants who are free of stroke at the study start. Each participant is assessed at study start (baseline) and every year thereafter for 5 years. The following data were collected relating hypertensive status measured at baseline to incident stroke over 5 years. Baseline: not hypertensive 1000 stroke 50 Baseline: hypertensive 300  stroke 20 Compute the cumulative incidence of stroke in patients classified as hypertensive at baseline.

Researchers at a medical school want to compare the rates of birth defects in babies born to mothers with low-fat diets with those born to mothers with high-fat diets. For one year, they collected data on all babies and their mothers in area hospitals, using information obtained from the mothers to determine whether they fall in the low fat or high fat diet category.A) Observational B) Experimental

A study is performed to examine the relationship between the concentration of plasma antioxidant vitamins and cancer risk. Table 7-66, shows data for plasma vitamin-A concentration in stomach cancer patients and in controls (participants similar to the cancer patients but free of disease). Is there a significant vitamins between patients with stomach cancer and controls? Run the appropriate test at a 5% level of significance.

. A cohort study is conducted to assess the association between clinical characteristics and the risk of stroke. The study involves n = 1370 participants who are free of stroke at the study start. Each participant is assessed at study start (baseline) and every year thereafter for 5 years. The following data were collected relating hypertensive status measured at baseline to incident stroke over 5 years. Free of Stroke at 5 Years Stroke Baseline: Not Hypertensive 1000 50 Baseline: Hypertensive 300 20 Compute the cumulative incidence of stroke in patients classified as hypertensive at baseline. A)0.20 B)0.50 C)0.0625 D)0.05

We have a sample of 2,400 geriatric patients who are in an assisted living home, of which 1,200 participated in a new preventative Drug A. Rates of UTIs tend to be higher than average among this population. As part of a preventative and treatment intervention, we are examining the performance of several drugs: Preventative Drug (before the onset of UTI) Drug A: preventative UTI drug taken daily in hopes to prevent the growth of bacteria that causes UTIs Treatment Drugs (after the onset of UTI) Drug B: New antibiotic for treating UTIs Drug C: Conventional antibiotic for treating UTIs Information for how many patients took each drug or combination of drugs is summarized below in the two tables. Use these to answer questions a) -d) Table 1. Summary of performance of drug A: UTI rates among those taking and not taking drug A Did not take Drug A Did take Drug A Total UTI 759 887 1646 No UTI 441 312 753 Total 1200 1200 2400 Table 2. Summary of performance of drug B and C: recovery…

A five year study was conducted among 5,000 men older than 65 years to examine the relationship between heavy alcohol consumption and the onset of atrial fibrillation. The men were assessed each year. Men who drank heavily contributed a total of 12,500 person-years of observation and 250 of those who drank heavily developed atrial fibrillation. A total of 24,000 person-years were observed for the entire study. And 100 men who did not drink heavily developed atrial fibrillation. What was the incidence density among heavy drinking men? What was the incidence density among non-heavy drinking men? What was the rate ratio and interpret ?

A five year study was conducted among 5,000 men older than 65 years to examine the relationship between heavy alcohol consumption and the onset of atrial fibrillation. The men were assessed each year. Men who drank heavily contributed a total of 12,500 person-years of observation and 250 of those who drank heavily developed atrial fibrillation. A total of 24,000 person-years were observed for the entire study. And 100 men who did not drink heavily developed atrial fibrillation. What was the cumulative incidence of atrial fibrillation in the study assuming no men had atrial fibrillation at the beginning of the study?  What was the point prevalence of atrial fibrillation at the beginning of the study?

Twenty-two young asthmatic volunteers were studied to assess the short-term effects of sulfur dioxide (SO2) exposure under various conditions [12]. The baseline data in Table 12.30 were presented regarding bronchial reactivity to SO2 stratified by lung function (as defined by forced expiratory volume / forced vital capacity [FEV1/FVC]) at screening. 12.7 Compare the means of each pair of groups using the LSD method.

A 5-year study among 601 participants with retinitis pigmentosa assessed the effects of high-dose vitamin A (15,000 IU per day) and vitamin E (400 IU per day) on the course of their disease. One issue is to what extent supplementation with vitamin A affected their serum-retinol levels. The serum-retinol data in Table 10.31 were obtained over 3 years of follow-up among 73 males taking 15,000 IU/day of vitamin A (vitamin A group) and among 57 males taking 75 IU/day of vitamin A (the trace group; this is a negligible amount compared with usual dietary intake of 3000 IU/day) 10.68 What test can be used to assess whether meanserum retinol has increased over 3 years among subjects inthe vitamin A group? 10.70 One assumption of the test in Problem 10.68 is thatthe distribution of serum retinol is approximately normal.To verify this assumption, the investigators obtained a frequency distribution of serum retinol at year 0 among malesin the vitamin A group, with data as shown in Table 10.32.…