A 7-year cohort study involving 1500 Australian adolescents assessed the associa
ID: 3045397 • 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
statisticically,
ho: there is no relationship exists between adolescent cannabis use and subsequent depression
h1: there is relationship exists between adolescent cannabis use and subsequent depression
chisq= 3.728101611
p-value 0.29236061
with chisq=3.72 and p-value >0.05, I reject ho and conclude that there is no relationship exists between adolescent cannabis use and subsequent depression
Bio-statistically,
Incidence rate is calculated at per 1000 person-year
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
4.284669244
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 Oi Pi Ei= N*pi = 1*pi (Oi-Ei)^2/Ei None to < 5 times ever 25 73.90% 30.299 0.92674349 5 times ever to less than weekly 9 15.70% 6.437 1.020501631 1 to 4 times per week 4 5.70% 2.337 1.183384253 Daily 3 4.70% 1.927 0.597472237 Total 41 1 41 3.728101611Related Questions
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