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. 2016 Nov 9;11(11):e0166140. doi: 10.1371/journal.pone.0166140

Table 2. Descriptions and Means of Explanatory Variables.

Explanatory Variables Descriptions Means
Perceived knowledge GM An integer variable ranging from 1 (strongly disagree) to 5 (strongly agree), determined by the level of agreement that scientific research supported a belief about the safety of GM foods. 3.278
Perceived knowledge GW An integer variable ranging from 1 (strongly disagree) to 5 (strongly agree), determined by the level of agreement that scientific research supported a belief about human involvement in GW. 3.662
Actual knowledge GM An integer variable ranging from 0 to 3, determined by the number of correctly answered true/false questions about GM foods. 2.050
Actual knowledge GW An integer variable ranging from 0 to 3, determined by the number of correctly answered true/false questions about GW. 1.062
Strong Democrat 1 if a respondent self-identified as a Strong Democrat, 0 otherwise. 0.094
Democrat 1 if a respondent self-identified as a Democrat, 0 otherwise. 0.192
Lean Democrat 1 if a respondent self-identified as an Independent Lean Democrat, 0 otherwise. 0.106
Independent 1 if a respondent self-identified as an Independent, 0 otherwise. 0.221
Lean Republican 1 if a respondent self-identified as an Independent Lean Republican, 0 otherwise. 0.080
Republican 1 if a respondent self-identified as a Republican, 0 otherwise. 0.149
Strong Republican 1 if a respondent self-identified as a Strong Republican, 0 otherwise. 0.063
CRT An integer variable ranging from 0 to 3, determined by the number of correctly answered Cognitive Reflection Test questions. 0.319
Age Age in years. 26.752
Bachelors 1 if Bachelor’s degree or higher, 0 otherwise. 0.293
Female 1 if female, 0 if male. 0.512
Income An integer variable ranging from 1 to 8, used to represent income categories (1 = $0–19,999, 2 = $20,000-$39,999…8 = $140,000 or more). 3.355
Illusory correlation GM An integer variable ranging from 3 (strongly disagree) to 15 (strongly agree), determined by the sum of three level of agreement questions measuring illusory correlations about GM foods. 8.981
Illusory correlation GW An integer variable ranging from 3 (strongly disagree) to 15 (strongly agree), determined by the sum of three level of agreement questions measuring illusory correlations about human involvement in GW. 7.715