Table 2

Past 30-Day Marijuana Use and Tobacco and Marijuana Co-Use among Past-Month Marijuana Users (n = 960) by Sociodemographic Characteristics
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.

Ramo and Prochaska

Ramo and Prochaska Addiction Science & Clinical Practice 2012 7:5   doi:10.1186/1940-0640-7-5

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