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. Author manuscript; available in PMC: 2021 Sep 1.
Published in final edited form as: Addict Behav. 2020 Apr 11;108:106437. doi: 10.1016/j.addbeh.2020.106437

Table 3.

Results from general linear models associating marijuana use characteristics with EFI scores.

Executive Function Subscale Attention Subscale Total Scale
Est. SE p-value Est. SE p-value Est. SE p-value
A. Former Users (n=2,969)
Intercept 11.64 0.76 <0.001 13.99 0.82 <0.001 30.78 1.69 <0.001
Use prior to the past 12 months
Age when began using marijuana most −0.01 0.01 0.24 −0.02 0.01 0.08 −0.03 0.02 0.17
Frequency of most use 0.08 0.15 0.57
 1–11 times in a year Ref. Ref. Ref.
 1–3 times a month −0.44 0.20 0.24 0.18 −0.12 0.40
 1–4 times a week −0.34 0.18 0.30 0.14 −0.29 0.34
 Every day or nearly every day −0.45 0.22 0.07 0.19 −0.59 0.44
Duration used marijuana the most (years, on log scale) −0.09 0.03 0.008 −0.09 0.04 0.026 −0.21 0.08 0.009
R2 p-value R2 p-value R2 p-value
0.10 <0.001 0.18 <0.001 0.19 <0.001
B. Current Users (n=695)
Intercept 6.25 0.44 <0.001 13.29 0.28 <0.001 22.80 0.83 <0.001
Use prior to the past 12 months
Age when began using marijuana most 0.01 0.00 0.04 0.00 0.02 0.83 0.03 0.03 0.24
Duration used marijuana the most (years, on log scale) −0.16 0.03 <0.001 −0.02 0.01 0.13 −0.30 0.08 <0.001
Use within the past 12 months
Frequency of use in the last 12 months 0.002 <0.001 <0.001
 1–11 times in the last year Ref. Ref. Ref.
 1–3 times a month −0.22 0.10 −0.73 0.14 −1.64 0.16
 1–4 times a week −0.35 0.12 −0.47 0.19 −1.10 0.28
 Every day or nearly every day −0.35 0.13 −0.06 0.18 −0.67 0.35
R2 p-value R2 p-value R2 p-value
0.11 <0.001 0.22 <0.001 0.24 <0.001

Note: All regression models included the following covariates: age, sex, race/ethnicity, education, SF-12 mental disability scale, SF-12 mental health scale, and co-occurring mental and substance use disorder per AUDADIS-5. The estimates provided reflect the difference in EFI scores associated with a 1-unit increase in the use characteristic (for continuous variables) or the difference when one group is compared to a referent group (for categorical variables). Est.=Estimate, Ref.=Reference group, SE=Standard Error.