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Table 1. 2013–2017 TSCI estimated past-year driving within 1 h of marijuana use, personal acceptance of driving after marijuana use, and support for per-se laws

From: Demographic and policy-based differences in behaviors and attitudes towards driving after marijuana use: an analysis of the 2013–2017 Traffic Safety Culture Index

Variable Level Unweighted sample sizea Weighted percent of total sample (95% CI) Drivers who self-reported driving within one hour of using marijuana at least once in the last year Respondents who said driving within one hour of using marijuana is somewhat or completely acceptable Respondents who somewhat or strongly support a per-se marijuana law
Weighted percent (95% CI) Rao-Scott \({\chi }^{2}\) p-valueb Weighted percent (95% CI) Rao-Scott \({\chi }^{2}\) p-valueb Weighted percent (95% CI) Rao-Scott \({\chi }^{2}\) p-valueb
Full sample NA 11,816 5.0 (4.5, 5.4) 9.7 (9.1, 10.3) 82.6 (81.8, 83.4)
Gender Male 5753 48.1 (47.1, 49.2) 6.5 (5.8, 7.3)   11.1 (10.1, 12.0)   80.5 (79.2, 81.7)  
Female 6063 51.9 (50.8, 52.9) 3.5 (2.9, 4.1)  < 0.001 8.4 (7.6, 9.3)  < 0.001 84.4 (83.4, 85.5)  < 0.001
Income  < $25,000 1888 17.3 (16.5, 18.1) 9.4 (7.6, 11.2)   13.8 (12.0, 15.7)   76.0 (73.7, 78.3)  
$25,000-$49,999 2570 22.0 (21.1, 22.9) 5.7 (4.5, 6.8)   10.1 (8.8, 11.5)   81.6 (79.8, 83.4)  
  $50,000-$74,999 2,220 18.2 (17.5, 19.0) 4.3 (3.2, 5.3)   9.2 (7.8, 10.7)   83.9 (82.1, 85.7)  
$75,000-$99,999 1708 14.6 (13.9, 15.4) 3.8 (2.7, 4.9)   9.3 (7.6, 11.0)   82.9 (80.8, 85.0)  
  $100,000 or more 3430 27.8 (26.9, 28.7) 3.5 (2.8, 4.2)  < 0.001 7.3 (6.3, 8.3)  < 0.001 86.2 (84.8, 87.5)  < 0.001
Race/ethnicity Non-Hispanic white 8696 66.0 (65.0, 67.1) 4.3 (3.8, 4.9)   9.9 (9.1, 10.6)   83.1 (82.1, 84.0)  
Non-Hispanic black 1047 11.5 (10.8, 12.3) 7.5 (5.5, 9.5)   11.5 (9.2, 13.7)   76.5 (73.5, 79.5)  
Non-Hispanic other 409 5.0 (4.4, 5.5) 5.9 (3.1, 8.7)   9.3 (6.1, 12.5)   89.5 (86.3, 92.6)  
Hispanic 1319 15.0 (14.1, 15.8) 5.2 (3.7, 6.7)   7.7 (6.0, 9.4)   83.9 (81.6, 86.2)  
Non-Hispanic 2 + races 345 2.5 (2.2, 2.9) 10.1 (5.3, 14.8) 0.002 9.6 (6.1, 13.2) 0.319 74.6 (68.9, 80.3)  < 0.001
Education Less than high school 1060 12.4 (11.6, 13.1) 8.5 (6.3, 10.7)   11.0 (8.9, 13.2)   78.1 (75.3, 80.9)  
  High school 3448 28.7 (27.7, 29.6) 4.7 (3.8, 5.5)   9.7 (8.6, 10.9)   82.0 (80.5, 83.5)  
Some college 3389 29.7 (28.8, 30.7) 5.5 (4.5, 6.4)   11.1 (9.9, 12.4)   81.4 (79.9, 83.0)  
  Bachelor’s or higher 3919 29.2 (28.3, 30.2) 3.6 (2.9, 4.3)  < 0.001 7.6 (6.6, 8.6) 0.002 86.0 (84.7, 87.3)  < 0.001
Age 19–29 1870 19.7 (18.8, 20.6) 11.6 (9.7, 13.4)   15.1 (13.3, 17.0)   76.0 (73.7, 78.3)  
  30–44 2661 25.7 (24.7, 26.6) 5.6 (4.6, 6.5)   12.0 (10.6, 13.5)   79.8 (78.1, 81.6)  
  45–59 3608 27.3 (26.4, 28.2) 3.4 (2.7, 4.1)   8.8 (7.7, 9.8)   83.4 (82.0, 84.8)  
  60 or older 3677 27.4 (26.5, 28.3) 1.8 (1.3, 2.3)  < 0.001 4.6 (3.8, 5.4)  < 0.001 88.7 (87.5, 89.9)  < 0.001
Marijuana Policy RM and MM illegal 6011 51.5 (50.4, 52.5) 4.3 (3.7, 5.0)   9.6 (8.7, 10.5)   81.7 (80.5, 82.8)  
RM illegal, MM legal 4855 41.0 (40.0, 42.0) 5.9 (5.1, 6.8)   9.6 (8.6, 10.6)   82.6 (81.4, 83.9)  
RM and MM legal 950 7.5 (7.0,8.1) 4.2 (2.7, 5.8) 0.024 10.6 (8.2,13.0) 0.733 87.8 (85.3, 90.3) 0.003
Per-se law Absent 8769 72.8 (71.9, 73.8) 5.1 (4.6, 5.7)   10.0 (9.3, 10.8)   81.6 (80.6, 82.5)  
  Present 3047 27.2 (26.2, 28.1) 4.5 (3.6, 5.4) 0.563 8.8 (7.6, 9.9) 0.319 85.1 (83.6, 85.5) 0.002
  1. aThe unweighted sample size includes those with missing values or non-response to questions (1)–(3)
  2. bBoldface denotes statistically significant between-group heterogeneity at the significance level of 0.05. p-values are adjusted using a Bonferroni-Holm correction