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. Author manuscript; available in PMC: 2022 Oct 1.
Published in final edited form as: Addict Behav. 2021 May 16;121:106985. doi: 10.1016/j.addbeh.2021.106985

Table 4a.

Model parameters from zero-inflated Poisson models predicting past year cannabis use with Peer Cannabis Use

Cannabis Use Days in the Past Year
Predictors Estimate SE z p
Count Model
(Intercept) 0.62 0.04 14.02 <.001
ageΔ 0.42 0.02 21.47 <.001
agem 0.42 0.02 24.20 <.001
Sex 0.51 0.01 49.50 <.001
FH Alc 0.00 0.01 −0.29 .744
PeerCan 1.01 0.02 65.97 <.001
ageΔ* PeerCan −0.06 0.01 −7.96 .226
agem * PeerCan −0.07 0.01 −10.49 <.001
ageΔ* agem * PeerCan −0.12 0.01 −19.71 <.001
Zero-Inflated Model
(Intercept) 5.14 0.42 12.20 <.001
ageΔ −0.27 0.15 −1.80 .072
agem −0.07 0.12 −0.57 .569
Sex −0.43 0.26 −1.63 .104
FH Alc −0.23 0.29 −0.79 .430
PeerCan −2.10 0.18 −11.53 <.001
ageΔ* PeerCan −0.03 0.06 −0.52 .606
agem * PeerCan −0.19 0.09 −2.13 .033
ageΔ* agem * PeerCan −0.15 0.07 −2.05 .041

Note. Zero-inflated portion reflects likelihood of being a “zero” (i.e., no drinking reported in the past year). ageΔ = Age Change; agem = Age Cohort; FH Alc = Family history density of alcohol use disorders; PeerCan = Peer Cannabis Use