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Table 2 Past 30-Day Marijuana Use and Tobacco and Marijuana Co-Use among Past-Month Marijuana Users (n = 960) by Sociodemographic Characteristics

From: Prevalence and co-use of marijuana among young adult cigarette smokers: An anonymous online national survey

  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)   
  1. 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.