Refer to the article “Control of Cardiovascular Risk Factors in Patients With Di
ID: 3350800 • Letter: R
Question
Refer to the article “Control of Cardiovascular Risk Factors in Patients With Diabetes and Hypertension at Urban Academic Medical Centers” (http://care.diabetesjournals.org/content/25/4/718.long)
a) Construct a 4x2 contingency table that illustrates the relationship between the following two variables: Hospital at which the patient was seen, and whether or not the patient had LDL £ 100 mg/dl. Use the Hospital names as the row headings and whether or not the patient had LDL £ 100 mg/dl as the column headings. Include the overall total as well as row and column totals. Use your table to answer the questions in parts b – e. (Note: Be careful when filling in your table - not all patients have data for these variables. When answering the questions below, use totals from your table.)
b) What percentage of all patients had LDL > 100 mg/dl?
c) What percentage of the patients at VAMC Brooklyn had LDL > 100 mg/dl?
d) What percentage of the patients at VAMC Detroit had LDL > 100 mg/dl?
e) What percentage of the patients having LDL £ 100 were seen at SUNY Brooklyn?
Explanation / Answer
following 4x2 table has been generated (exluding total)
(b) What percentage of all patients had LDL > 100 mg/dl ?
required answer=100*643/997=64.5( one decimal approximation)
c) What percentage of the patients at VAMC Brooklyn had LDL > 100 mg/dl?
required anwer=100*195/354=55.1 ( one decimal approximation)
d) What percentage of the patients at VAMC Detroit had LDL > 100 mg/dl?
required anwer=100*100/192=52.1 ( one decimal approximation)
e) What percentage of the patients having LDL £ 100 were seen at SUNY Brooklyn?
required anwer=100*92/99=92.9 ( one decimal approximation)
( LDL is upto 100)
Hospital Brooklyn VAMC SUNY Brooklyn Detroit VAMC WSU-UHC Detroit total LDL >100 195 341 100 7 643 <100 159 11 92 92 354 total 354 352 192 99 997