A cohort study involving Swedish females born between 1952 and 1989 assessed the
ID: 3127227 • Letter: A
Question
A cohort study involving Swedish females born between 1952 and 1989 assessed the association between eating disorders and parental education. From the results of the study, shown in the following table, calculate whether a relationship exists between mother’s education and the daughter’s risk of having an eating disorder. Interpret the result.
Mother’s Education
Number
%
Number of Events
Person-Years at Risk
Elementary
2,791
21.3
10
42,592
Secondary
6,365
48.5
21
80,468
Postsecondary
3,968
30.2
22
43,358
Missing
252
Mother’s Education
Number
%
Number of Events
Person-Years at Risk
Elementary
2,791
21.3
10
42,592
Secondary
6,365
48.5
21
80,468
Postsecondary
3,968
30.2
22
43,358
Missing
252
Explanation / Answer
For elementary :
Risk = 10/42592 = 0.00023478 = 23.478 per 10000 a year
For Secondary,
Risk = 21/80468 = 0.00026097 = 26.1 per 10000 a year
Rate ratio = 26.1/23.478 = 1.11
For post Secondary,
Risk = 22/43358 = 0.0005074 = 50.74 per 10000 a year
Ratio = 50.74/23.478 = 2.137
Relationship for post Secondary compared to elementary the risk would be 2.13 of having an eating disorder.
Relationship for Secondary compared to elementary the risk would be 1.11 of having an eating disorder.
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