Objective

The current study examined the developmental interrelationships between alcohol and marijuana use trajectories from ages 10 to 18 years in a sample of North American Indigenous adolescents. Distinct co-use groups were formed to create profiles of young adult outcomes.

Method

Dual group-based trajectory models of marijuana and alcohol frequency were estimated using data from a longitudinal community-based participatory study of Indigenous adolescents from the upper Midwest and Canada. Joint probabilities were used to create co-use groups, and profiles were created using early adult (Mean Age – 26.28 years) outcomes.

Results

Four joint trajectory groups were identified: 1) no marijuana and no/low alcohol use (34.4%), 2) mid-onset alcohol only (14%), 3) mid-onset co-use starting at age 13 (24%), and 4) early-onset co-use starting at age 11 (22%). High probabilities existed that adolescents would use marijuana early if they began drinking alcohol at the youngest ages, and that adolescents would not use marijuana if they drank infrequently or delayed drinking until mid-adolescence. Adult outcomes were poorer for the early- and mid-onset co-use groups, but there were few differences between the no/low use and alcohol-only groups.

Conclusion

Co-use of marijuana and alcohol was associated with poorer outcomes in early adulthood, particularly for the group with an earlier age of onset. Abstaining from either substance in adolescence was associated with better outcomes.

中文翻译：

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北美原住民中酒精和大麻使用的青少年发展轨迹与成年早期结果相结合

客观的

目前的研究调查了北美土著青少年样本中 10 至 18 岁的酒精和大麻使用轨迹之间的发展相互关系。形成了不同的共同使用小组来创建年轻成人结果的概况。

方法

使用来自中西部上游和加拿大土著青少年的纵向社区参与性研究的数据估计了基于双组的大麻和酒精频率轨迹模型。联合概率用于创建共同使用组，并使用成年早期（平均年龄 - 26.28 岁）结果创建配置文件。

结果

确定了四个关节轨迹组：1) 不吸食大麻和不使用/低度饮酒 (34.4%)，2) 仅中度饮酒 (14%)，3) 从 13 岁开始的中度共同使用 (24%) , 和 4) 从 11 岁开始的早发性共同使用 (22%)。如果青少年在最年轻的时候开始饮酒，他们很可能会很早就开始使用大麻，如果他们不经常饮酒或将饮酒推迟到青春期中期，他们也不会使用大麻。早发性和中发性共同使用组的成人结果较差，但不/低使用组和仅饮酒组之间几乎没有差异。

结论

大麻和酒精的共同使用与成年早期的较差结果有关，特别是对于发病年龄较早的群体。在青春期放弃这两种物质与更好的结果相关。