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. Author manuscript; available in PMC: 2023 Jan 1.
Published in final edited form as: Subst Abus. 2021 Jul 20;43(1):531–538. doi: 10.1080/08897077.2021.1949777

Table 3.

Means and SDs of Indicator Variables for 4-class LPA Model

Alcohol
AO
M (SE)		 Cannabis
AO
M (SE)		 Tobacco
AO
M (SE)
Class 1: Earliest AO for Alcohol 9.03 (.03)a 16.34 (.14)a 15.79 (.16)a
Class 2: Latest AO of Substances 17.42 (.19)b 18.17 (.22)b 17.06 (.22)b
Class 3: Late AO of Substances 15.07 (.04)c 16.66 (.07)c 16.18 (.07)c
Class 4: Earliest AO for Cannabis and Tobacco 12.30 (.34)d 15.63 (.51)d 14.72 (.46)d

Note. AOs significantly varied across classes. Class values that do not share the same superscript are significantly different on the indicator between the classes. AO = age of onset. Sample sizes by classes were: Class 1 = 101; Class 2 = 33; Class 3 = 346; Class 4 = 30. M = Mean, SE = standard error.