Epidemiology Essay Example | Topics and Well Written Essays - 2250 words

Epidemiology - Essay Example In contrast, absolute measures, computed as a difference rather than a ratio, produce estimates with quite different interpretations. a) The type of misclassification portrayed in this case study is non- differential and random. The same misclassification occurs in the same proportion in each group. The percentage unto which the cases were underestimated is the same percentage, which the controls were over estimated. These leads to an underestimation of the true association hence the true association cannot be established. A relative risk ratio of more than one indicates that the occurrence of the event at hand is more likely to the experimental group than the control group. This misclassification reduced the relative risk ratio hence reducing the likelihood of the event occurring to the experimental group. This means underestimating the true association. b. Outcome variables of a study are measurements of population’s current status which might include mean, mode and median of continuous counts of measurements for example radio frequency exposure in megahertz, age, duration of exposure of radiation in hours and type of phone used. c. Study factors (exposures): cellular phone calls radio frequency measure by the kind of phone used, the duration of use and the ear use to receive the call. The second factor is brain tumor measured by anatomical area of the tumor. 2. a. The participation rate in this study is the percentage of the total number targeted that participated in the study =2899/3234*100=89.64%. The high participation rate is one of the characteristic of a good epidemiologic study. This implies that the results of the study are highly representative of the actual population. b. Response rate in survey research refers to the ratio of number of people who answered the survey divided by the number of people in the sample. It is usually expressed in the form of a