Exercise 4 A 2011 article published in the American Jourmal of Public Health rep
ID: 3072046 • Letter: E
Question
Exercise 4 A 2011 article published in the American Jourmal of Public Health reports on the association between neighborhood socioeconomic status and cognitive function in women. 1 As per the authors, the study sample was obtained as follows "We assessed women aged 65 to 81 years (n 7479) who were free of dementia and took part in the Women's Health Initiative Memory Study The following graphic is included in the manuscript: 8 25715 01 (714 02 The 3MSE score is a standardized measure of cognitive functioning (higher values indicate higher cognitive function), and the NSES quartiles are ordinal categories of neighborhood sociocconomic status (SES) scores for the subjects in the study. (Higher scores indicate higher neighborhood SES). Both measures (3MSE scores and NSES scores) were based on information collected from each woman via a survey administered at one time. 24. What is the range of 3MSE scores across all women included in the stud? 25. Which of the NSES quartiles includes the woman with the lowest 3MSE score? 26. Approximately, what is the median 3MSE score for NSES Q1? 27. Approximately, what is the median 3MSE score for NSES Q4? 28. What is the difference in 3MSE medians for Q4 compared to Q1? 29. What type of distribution do the 3MES scores have in the four NSES quartiles? 30. How do you expect the mean 3MSE score to compare to the median MSE score for NSES Q3 Generally, what is the nature of the relationship between 3MSE scores and NSES 31. 1 Shih R, et al. Neighborhood Socioeconomic Status and Cognitive Function in Women. American Journal ofExplanation / Answer
24. The maximum score across all quarters is 100 and the minimum score is 66. So the range of 3MSE scores for all the women in the study is 100-66 ie 34.
25. The Quartile 3 includes the woman with the lowest 3MSE score.
26,27. The median score is found by the line drawn inside the box. For Q1 the median score is 95 and for quarter 4 the median score is 97.
28. The difference between the median scores of Q1 and Q4 is 2.
29. The 3MSE score have a negatively skewed distribution in the NSES quartiles. This can be observed from the whiskers, median line and the tail.
30. Since Q3 has a negatively skewed distribution we would expect the mean to be lower than the median.
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