| |
Past 30-Day Marijuana Use
|
Percentage of Days Using Tobacco or Marijuana in which Both Substances Were Used
|
|---|
|
Variable
|
Median
|
Interquartile Range
|
Group Comparisons
|
p
|
Median
|
Interquartile Range
|
Group comparisons
|
p
|
|
Gender
| | |
z = -1.01
|
0.311
| | |
z = -.25
|
0.801
|
|
Male
|
19.0
|
(5.0, 30.0)
| | |
48.4
|
(13.8, 90.3)
| | |
|
Female
|
16.0
|
(4.0, 30.0)
| | |
42.1
|
(12.9, 90.3)
| | |
|
Age
| | |
z = -1.10
|
0.271
| | |
z = -.54
|
0.588
|
|
18–20
|
18.0
|
(5.0, 30.0)
| | |
48.0
|
(14.3, 89.3)
| | |
|
21–25
|
17.0
|
(3.0, 30.0)
| | |
45.2
|
(10.9, 93.5)
| | |
|
Ethnicity
| | |
χ(5)2 = 5.78
|
0.300
| | |
χ2
(5)
= 11.22
|
0.047
|
|
African-American
|
8.0
|
(4.0, 28.5)
| | |
35.1
|
(13.0, 72.4)
| | |
|
Asian/Pacific Islander
|
17.0
|
(3.0, 30.0)
| | |
14.3
|
(6.3, 74.2)
| | |
|
Caucasian
|
18.5
|
(5.0, 30.0)
| | |
50.0
|
(14.3, 93.5)
| | |
|
Hispanic/Latino
|
15.0
|
(2.0, 26.0)
| | |
38.7
|
(6.5, 78.6)
| | |
|
Multi-Ethnic
|
17.0
|
(4.0, 30.0)
| | |
42.1
|
(13.0, 83.3)
| | |
|
Other
|
14.0
|
(6.0, 30.0)
| | |
41.9
|
(14.3, 93.5)
| | |
|
Household Income
| | |
χ(6)2 = 2.96
|
0.814
| | |
χ(6)2 = 4.71
|
0.582
|
|
Less than $20,000
|
16.0
|
(5.0, 30.0)
| | |
47.8
|
(14.7, 90.3)
| | |
|
$21,000–$40,000
|
19.0
|
(5.0, 30.3)
| | |
52.7
|
(12.5, 94.3)
| | |
|
$41,000–$60,000
|
20.0
|
(3.0, 30.0)
| | |
51.6
|
(12.5, 96.8)
| | |
|
$61,000–$80,000
|
17.0
|
(4.0, 29.0)
| | |
40.0
|
(14.0, 82.3)
| | |
|
$81,000–$100,000
|
18.0
|
(4.0, 30.0)
| | |
48.4
|
(12.9, 96.8)
| | |
|
$100,000–$200,000
|
18.0
|
(6.3, 28.0)
| | |
41.8
|
(13.1, 76.8)
| | |
|
Region
| | |
χ(3)2 = 1.83
|
0.609
| | |
χ2
(3)
= 11.12
|
0.011
|
|
Northeast
|
19.0
|
(7.0, 30.0)
| | |
57.1
|
(19.7, 93.5)
| | |
|
Midwest
|
17.0
|
(7.0, 30.0)
| | |
48.4
|
(22.2, 90.3)
| | |
|
South
|
16.0
|
(4.0, 30.0)
| | |
42.0
|
(12.8, 84.1)
| | |
|
West
|
19.0
|
(3.8, 30.0)
| | |
38.3
|
(9.1, 90.3)
| | |
|
Urban/Rural
| | |
z = -1.48
|
0.140
| | |
z = -2.35
|
0.019
|
|
Urban
|
17.0
|
(4.0, 30.0)
| | |
45.2
|
(12.9, 87.1)
| | |
|
Rural
|
20.5
|
(6.25, 31.0)
| | |
57.9
|
(22.6, 96.8)
| | |
|
Medical Marijuana State
| | |
z = -0.42
|
0.672
| | |
z = -1.10
|
0.272
|
|
Yes
|
19.0
|
(4.0, 30.0)
| | |
41.7
|
(10.7, 93.5)
| | |
|
No
|
17.0
|
(4.0, 30.0)
| | |
48.3
|
(15.9, 87.3)
| | |
|
Student Status
| | |
z = -4.00
|
0.000
| | |
z = -4.59
|
0.000
|
|
Student
|
13.0
|
(3.0, 28.0)
| | |
30.0
|
(7.1, 77.4)
| | |
|
Non-student
|
19.0
|
(6.0, 30.0)
| | |
51.6
|
(17.0, 93.5)
| | |
|
Daily Smoking Status
| | |
z = -5.34
|
0.000
| | |
z = -11.49
|
0.000
|
|
Daily smoker
|
21.0
|
(7.0, 30.0)
| | |
65.6
|
(22.7, 96.8)
| | |
|
Non-daily smoker
|
10.5
|
(3.0, 26.0)
| | |
20.0
|
(5.6, 47.2)
| | |
|
Total Sample
|
18.0
|
(4.0, 30.0)
| | |
45.5
|
(13.1, 90.3)
| | |
- Note. Tests of group differences with two groups used Mann–Whitney z-test, and more than two groups used Kruskal-Wallace chi-square (χ2). Significant differences within sociodemographic variables are in bold text.
