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Table 1 Accuracy of judging THC content based on “edible” cannabis packaging and consumer status (n = 45,504)

From: THC labeling on cannabis products: an experimental study of approaches for labeling THC servings on cannabis edibles

Variable No cannabis consumption in past 12 months (n = 29,731) “Any” cannabis consumption in past 12 months (n = 15,773) Edible cannabis consumption in past 12 months (n = 8241)
AOR (95% CI) p-value AOR (95% CI) p-value AOR (95% CI) p-value
Packaging manipulation X2(2) = 10.86 0.004 X2(2) = 0.08 0.959 X2(2) = 0.02 0.992
 Multi-serving bar vs. individual squares 1.09 (1.03, 1.16) 0.002 1.01 (0.93, 1.10) 0.791 0.99 (0.88, 1.12) 0.913
 Individually packaged squares vs. individual squares 1.08 (1.02, 1.14) 0.010 1.00 (0.92, 1.09) 0.972 1.00 (0.89, 1.12) 0.995
 Individually packaged squares vs. multi-serving bar 0.99 (0.93, 1.04) 0.615 0.99 (0.91, 1.07) 0.817 1.01 (0.90, 1.13) 0.907
Stamp manipulation X2(1) = 15.13 < 0.001 X2(1) = 4.80 0.028 X2(2) = 0.00 0.988
 No stamp (ref) --ref-- --ref-- --ref-- --ref-- --ref-- --ref--
 THC stamp 1.10 (1.05, 1.15) < 0.001 1.08 (1.01, 1.15) 0.028 1.00 (0.91, 1.10) 0.988
Age group X2(4) = 447.77 < 0.001 X2(4) = 54.80 < 0.001 X2(4) = 10.41 0.034
 16–25 (ref) --ref-- --ref-- --ref-- --ref-- --ref-- --ref--
 26–35 0.86 (0.79, 0.94) < 0.001 0.95 (0.86-1.06) 0.339 1.02 (0.88, 1.17) 0.839
 36–45 0.77 (0.71, 0.84) < 0.001 0.88 (0.79, 0.98) 0.022 0.97 (0.83, 1.13) 0.680
 46–55 0.64 (0.58, 0.69) < 0.001 0.83 (0.73, 0.93) 0.001 0.89 (0.75, 1.05) 0.161
 56–65 0.47 (0.43, 0.51) < 0.001 0.68 (0.60, 0.76) < 0.001 0.81 (0.68, 0.96) 0.014
Sex X2(1) = 91.15 < 0.001 X2(1) = 122.45 < 0.001 X2(1) = 78.78 < 0.001
 Female (ref) --ref-- --ref-- --ref-- --ref-- --ref-- --ref--
 Male 0.78 (0.74, 0.82) < 0.001 0.67 (0.62, 0.72) < 0.001 0.63 (0.57, 0.70) < 0.001
Jurisdiction X2(1) = 167.31 < 0.001 X2(2) = 96.68 < 0.001 X2(2) = 62.11 < 0.001
 Canada (ref) --ref-- --ref-- --ref-- --ref-- --ref-- --ref--
 US “illegal” states 1.28 (1.21, 1.37) < 0.001 0.98 (0.89, 1.08) 0.710 0.93 (0.81, 1.07) 0.304
 US “legal” states 1.43 (1.35, 1.51) < 0.001 1.39 (1.29, 1.50) < 0.001 1.42 (1.27, 1.59) < 0.001
Education X2(4) = 48.78 < 0.001 X2(1) = 51.70 < 0.001 X2(4) = 42.37 < 0.001
 Less than high school (ref) --ref-- --ref-- --ref-- --ref-- --ref-- --ref--
 High school diploma or equivalent 0.89 (0.80, 0.99) 0.032 0.92 (0.80, 1.06) 0.270 0.96 (0.77, 1.19) 0.701
 Some college/university or technical training 1.06 (0.95, 1.17) 0.287 1.20 (1.05, 1.38) 0.008 1.32 (1.07, 1.62) 0.009
 Bachelor’s degree or higher 1.05 (0.94, 1.17) 0.372 1.07 (0.93, 1.24) 0.336 1.13 (0.91, 1.41) 0.256
 Unstated 0.44 (0.31, 0.64) < 0.001 0.35 (0.20, 0.62) < 0.001 0.18 (0.07, 0.47) < 0.001
Ethnicity X2(1) = 112.42 < 0.001 X2(1) = 78.42 < 0.001 X2(1) = 46.71 < 0.001
 White (ref) --ref-- --ref-- --ref-- --ref-- --ref-- --ref--
 Other/mixed/unstated 0.73 (0.69, 0.78) < 0.001 0.70 (0.64, 0.76) < 0.001 0.68 (0.61, 0.76) < 0.001
Perceived income adequacy (difficulty making ends meet) X2(5) = 184.80 < 0.001 X2(5) = 79.67 < 0.001 X2(5) = 36.25 < 0.001
 Very difficult (ref) --ref-- --ref-- --ref-- --ref-- --ref-- --ref--
 Difficult 0.91 (0.84, 1.00) 0.051 1.05 (0.93, 1.18) 0.452 1.08 (0.91, 1.29) 0.370
 Neither easy nor difficult 0.78 (0.72, 0.85) < 0.001 0.94 (0.84, 1.06) 0.302 0.94 (0.79, 1.11) 0.446
 Easy 0.85 (0.77, 0.93) < 0.001 0.94 (0.83, 1.07) 0.376 1.00 (0.83, 1.21) 0.978
 Very easy 0.72 (0.65, 0.80) < 0.001 0.75 (0.65, 0.86) < 0.001 0.95 (0.77, 1.17) 0.017
 Unstated 0.36 (0.31, 0.43) < 0.001 0.42 (0.33, 0.54) < 0.001 0.45 (0.31, 0.64) < 0.001
  1. Odds of responding correctly to question, “How many squares of chocolate should someone eat if they want one serving of THC?” (correct response = < 1 square or 1 square). Logistic regression models, adjusting for age sex, education, ethnicity, income adequacy, and survey device type. Each column shows results stratified by subsample based on cannabis consumption status
  2. “Legal” states refer to US states in which non-medical cannabis was legal at the time the study was completed
  3. AOR Adjusted odds ratio, ref Reference category, SD Standard deviation, 95% CI 95% confidence interval, X2(df) Chi-squared statistic (degrees of freedom)