A 7-year cohort study involving 1500 Australian adolescents assessed the associa
ID: 3219190 • Letter: A
Question
A 7-year cohort study involving 1500 Australian adolescents assessed the association between frequency of cannabis use and subsequent depression in young adulthood. From the results of the study, shown in the following table, calculate whether a relationship exists between adolescent cannabis use and subsequent depression. Please interpret the result.
Cannabis Use
Number
%
Number of Depression Cases
Person-Years at Risk
None to < 5 times ever
1,108
73.9
25
7,352
5 times ever to less than weekly
236
15.7
9
1,430
1 to 4 times per week
86
5.7
4
472
Daily
70
4.7
3
315
Total
1,500
100.
41
9,569
Cannabis Use
Number
%
Number of Depression Cases
Person-Years at Risk
None to < 5 times ever
1,108
73.9
25
7,352
5 times ever to less than weekly
236
15.7
9
1,430
1 to 4 times per week
86
5.7
4
472
Daily
70
4.7
3
315
Total
1,500
100.
41
9,569
Explanation / Answer
First we calculate incidence rate for all cannabis use
Incidence rate is calculated at per 1000 person year
It can be interpreted as the number of depression cases decreases accordingly to the Cannabis use. The cannabis seems to decrease the rate incidence of depression in user
Cannabis Use Number % Number of Depression Cases Person-Years at Risk Incidence rate Relative risks None to < 5 times ever 1,108 73.9 25 7,352 3.400435256 5 times ever to less than weekly 236 15.7 9 1,430 6.293706294 1.850853147 1 to 4 times per week 86 5.7 4 472 8.474576271 2.49220339 Daily 70 4.7 3 315 9.523809524 2.800761905 Total 1,500 100 41 9,569 4.284669244Related Questions
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