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A case-control study was carried out to estimate the interrelationships between the different risk factors for the myocardial infarction (heart disease). Information on smoking status was gathered from a total of 791 cases and controls. Current cigarette smoking, described as smoking within the past three months, was reported by the 158 of the 367 cases and 111 of the 424 controls.
a) Set up the suitable two-by-two table and determine a measure of association between current smoking and myocardial infarction.
b) Determine a measure of the excess risk of myocardial infarction in cigarette smokers that is attributable to their smoking.
c) Specify any assumptions which you make in carrying out these calculations and provide interpretations for both calculations.
Recently, use of cleaner fuels has greatly reduced soot in the landscape, and dark-coloured moths have been disappearing. Should the two forms of moths be considered separate species.
Birds and mammals have a four-chambered heart, with two ventricles and two atria, but other modern reptiles have a three-chambered heart, with just one ventricle. Paleontologists debate whether dinosaurs had a typical "reptile-like" heart or a "birdl..
Determine the percentage of offspring displaying each trait. If a single, diploid G2 nucleus in an ascus contains 400 nanograms (ng) of DNA, after that a single ascospore nucleus of this species should contain how much DNA (ng), carried on how many c..
With respect to the case-control studies compare the usefulness of the hospital and neighbourhood (community) controls. Your comparison must involve a comparison of the cost, feasibility, co-operation of the controls, recall bias, selection of contro..
Using the understanding of osmosis describe, why putting salt on a pork chop before cooking it on a grill is probable to result in a dry tough piece of meat.
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It had been the warm, wet spring and she complained of a large number of flies in the area. She felt sick last day there after eating some canned food, as there was no cooler there. You had no time for culturing, as you require taking action fast.
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Describing inheritance of traits or genetic disorders genetic disorders.determine the modifications (percentages) for having a healthy child (not a carrier).
What would your expected results be (growth or no growth) if you transformed bacteria with a plasmid that had ampicillin and kanamynic (another antibiotic) resistance and plated them. Situation growth or no growth and explain your reply.
You are designing a new single-celled organism. Discuss the problems of size, getting molecules like nutrients and wastes in and out, temperature, energy and replication of genetic materials.
Does Chinese crocodile lizard communicate are these animals endangered or threatened if yes why are there number decreasing or is there population stable.
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