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. Author manuscript; available in PMC: 2016 Jan 31.
Published in final edited form as: Addict Behav. 2014 Sep 28;41:51–57. doi: 10.1016/j.addbeh.2014.09.030

Table 2.

Estimated transition probabilities and adjusted odds by grade and subtype of academic and behavior problems

Estimated Transition Probability AOR (95% CI)a
p-value
No problems Externalizing
Behavior
Problems		 Academic and
Attention/
Concentration
Problems		 Externalizing
vs.
No problems		 Academic and
Attention/
Concentration
Problems
vs.
No Problems		 Externalizing
vs.
Academic and
Attention/
Concentration
Problems
No involvement to
offered marijuana
6th to 7th 0.11 0.15 0.10 1.33 (0.66, 2.67)
p=0.422		 0.90 (0.28, 2.83)
p=0.857		 1.48 (0.43, 5.10)
p=0.534
7th to 8th 0.20 0.15 0.10 0.72 (0.35, 1.49)
p=0.376		 0.44 (0.13, 1.54)
p=0.199		 1.63 (0.42, 6.37)
p=0.482
8th to 9th 0.21 0.31 0.05 1.63 (0.79, 3.37)
p=0.187		 0.22 (0.04, 1.21)
p=0.082		 7.25 (1.25, 41.92)
p=0.027
No involvement to
use and problems
6th to 7th 0.02 0.05 0.07 2.37 (0.65, 8.59)
p=0.189		 3.40 (0.78, 14.81)
p=0.103		 0.70 (0.14, 3.41)
p=0.659
7th to 8th 0.01 0.09 0.08 10.83 (2.16, 54.39)
p=0.004		 10.69 (1.73, 66.13)
p=0.011		 1.01 (0.23, 4.39)
p=0.989
8th to 9th 0.04 0.09 0.19 1.96 (0.53, 7.18)
p=0.310		 3.55 (0.99, 12.76)
p=0.052		 0.55 (0.12, 2.60)
p=0.451
Offered marijuana to
use and problems
6th to 7th 0.27 0.18 0.17 0.65 (0.15, 2.79)
p=0.562		 0.70 (0.10, 9.00)
p=0.784		 0.95 (0.09, 10.49)
p=0.967
7th to 8th 0.11 0.06 0.00 0.34 (0.06, 1.86)
p=0.213		 --b --b
8th to 9th 0.11 0.18 0.50 1.27 (0.18, 8.80)
p=0.809		 5.99 (1.37, 26.12)
p=0.017		 0.21 (0.04, 1.06)
p=0.059
a

Models adjusted for gender, intervention status, and free or reduced lunch status

b

Youth with academic and attention/concentration problems had a zero probability of transitioning from being offered marijuana to marijuana use and problems in 7th to 8th grades.