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Table 3 Adjusted Incidence Rate Ratios (IRR, 95% CI) between predictors and CUDIT total score (Range: 0–40) from Poisson GEE

From: Associations between simultaneous use of alcohol and cannabis and cannabis-related problems in 2014–2016: evidence from the Washington panel survey

 

Model 5

Model 6

Model 7

Model 8

Co-use of alcohol and marijuana

 SAM vs. Concurrent

1.22, (1.01, 1.46)*

1.22, (1.02, 1.47)*

1.22, (1.05, 1.42)*

1.17, (1.02, 1.34)*

Marijuana use frequency

 Regular vs. Infrequent

-

-

-

1.66, (1.27, 2.18)***

 Daily/near daily vs. Infrequent

-

-

-

3.3, (2.44, 4.46)***

 Daily/near daily vs. Regular

-

-

-

1.98, (1.65, 2.39)***

Log marijuana daily quantity

-

-

1.25, (1.18, 1.33)***

1.1, (1.04, 1.16)***

Log alcohol volume

-

0.99, (0.94, 1.04)

0.99, (0.95, 1.03)

1, (0.97, 1.04)

Time to nearest marijuana outlet

1, (0.99, 1.01)

1, (0.99, 1.01)

1, (0.997, 1.004)

0.998, (0.995, 1.002)

Medical marijuana recommendation (ref: no)

 Have medical recommendation

1.18, (0.95, 1.48)

1.18, (0.94, 1.47)

1.12, (0.95, 1.32)

1.01, (0.86, 1.19)

Sex (ref: male)

 Female

0.7, (0.56, 0.88)**

0.7, (0.56, 0.88)**

0.84, (0.69, 1.02)

0.87, (0.73, 1.05)

Race/ethnicity (ref: White)

 Black

1.16, (0.74, 1.83)

1.17, (0.74, 1.84)

0.93, (0.66, 1.32)

0.94, (0.7, 1.27)

 Hispanic

1.17, (0.76, 1.78)

1.17, (0.77, 1.79)

1.2, (0.85, 1.7)

1.13, (0.75, 1.69)

 Others/missing

1.1, (0.65, 1.87)

1.1, (0.65, 1.86)

1.31, (0.88, 1.94)

1.23, (0.9, 1.69)

Education (ref: less than high school)

 Some college or more

0.84, (0.67, 1.06)

0.84, (0.67, 1.06)

0.95, (0.79, 1.14)

0.94, (0.79, 1.11)

Age group (ref: 18–29)

 30–49

0.64, (0.48, 0.84)**

0.64, (0.48, 0.84)**

0.7, (0.56, 0.87)**

0.79, (0.64, 0.97)*

 >=50

0.71, (0.52, 0.98)*

0.72, (0.52, 0.99)*

0.82, (0.64, 1.07)

0.83, (0.65, 1.07)

Onset age of marijuana use (ref: >=26)

 <=17

1.05, (0.72, 1.53)

1.05, (0.72, 1.53)

0.91, (0.65, 1.27)

0.96, (0.69, 1.33)

 18–25

0.85, (0.59, 1.23)

0.85, (0.6, 1.21)

0.77, (0.55, 1.06)

0.88, (0.64, 1.22)

Family annual income (ref: >80,000)

 <50,000

1.27, (0.94, 1.73)

1.27, (0.94, 1.72)

1.03, (0.8, 1.32)

0.89, (0.71, 1.11)

 $50,000–80,000

1.1, (0.76, 1.58)

1.1, (0.76, 1.57)

1.03, (0.77, 1.37)

0.87, (0.67, 1.12)

Marital status (ref: unmarried)

 Married

0.94, (0.74, 1.2)

0.94, (0.74, 1.2)

0.9, (0.75, 1.08)

0.85, (0.72, 1.01)

Employment status (ref: unemployed/retired/etc.)

 Full-time or part-time

0.92, (0.7, 1.2)

0.92, (0.7, 1.21)

0.94, (0.76, 1.16)

0.98, (0.79, 1.21)

Survey cycle [ref: panel 1 (Sept.-Nov. 2014)]

 Panel 2 (March-June 2015)

1.11, (0.85, 1.44)

1.11, (0.85, 1.44)

1.12, (0.87, 1.44)

1.01, (0.82, 1.24)

 Panel 3 (August-Oct. 2015)

1.2, (0.93, 1.54)

1.2, (0.93, 1.54)

1.23, (0.97, 1.56)

1.08, (0.89, 1.31)

 Panel 4 (March-April 2016)

1.12, (0.88, 1.42)

1.12, (0.88, 1.42)

1.08, (0.87, 1.33)

0.96, (0.81, 1.13)

  1. All models were adjusted for sex, race/ethnicity, education, age of marijuana use onset, age group, marital status, employment status, family income, panel survey cycle, medical marijuana recommendation, driving time to nearest marijuana outlet (minutes), and accounted for differential probability of selection and response rates through survey weights. Besides, in Model 6, we additionally adjusted for natural log transformed alcohol volume; in Model 7, we additionally adjusted for natural log transformed marijuana daily quantity and alcohol volume consumed; in Model 8, we additionally adjusted for marijuana use frequency, natural log transformed marijuana daily quantity and alcohol volume
  2. *p < 0.05
  3. **p < 0.01
  4. ***p < 0.001
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Journal of Cannabis Research

ISSN: 2522-5782