Department of Psychiatry, Washington University School of Medicine, St. Louis, MO, USA.
Center for Technology and Behavioral Health, Dartmouth Geisel School of Medicine, Lebanon, NH, USA.
Prev Med. 2020 Feb;131:105956. doi: 10.1016/j.ypmed.2019.105956. Epub 2019 Dec 19.
Driving under the influence of cannabis (DUIC) is a public health concern, and data are needed to develop screening and prevention tools. Measuring the level of intoxication that cannabis users perceive as safe for driving could help stratify DUIC risk. This study tested whether intoxication levels perceived as safe for driving predicted past-month DUIC frequency. Online survey data were collected in 2017 from a national sample of n = 3010 past-month cannabis users with lifetime DUIC (age 18+). Respondents indicated past-month DUIC frequency, typical cannabis intoxication level (1-10 scale), and cannabis intoxication level perceived as safe for driving (0-10 scale). Approximately 24%, 38%, 13%, and 24% of respondents engaged in DUIC on 0, 1-9, 10-19, and 20-30 days respectively in the past month. Among these four DUIC frequency groups, median typical intoxication varied little (5-6), but median intoxication perceived as safe for driving varied widely (3-8). Higher intoxication levels perceived as safe for driving corresponded to frequent DUIC (Spearman's rho: 0.46). For each unit increase in intoxication level perceived as safe for driving, the odds of past-month DUIC increased 18% to 68% (multinomial logistic regression odds ratio - MOR: 1.18, 95% CI: 1.13-1.23; MOR: 1.40, 95% CI: 1.30-1.50; MOR: 1.68, 95% CI: 1.57-1.80). In this targeted sample of past-month cannabis users, DUIC frequency varied widely, but daily/near-daily DUIC was common (24%). Measuring intoxication levels perceived as safe for driving permits delineation of past-month DUIC frequency. This metric has potential as a component of public health prevention tools.
吸食大麻后开车（DUIC）是一个公共卫生关注点，需要数据来开发筛查和预防工具。测量大麻使用者认为安全驾驶的致醉程度可以帮助划分 DUIC 风险。本研究测试了驾驶安全感知的致醉水平是否可以预测过去一个月 DUIC 的频率。2017 年，通过一项全国性的终生有过 DUIC 的大麻使用者（年龄 18 岁及以上）的样本，在线调查收集了数据。受访者报告了过去一个月 DUIC 的频率、典型大麻致醉水平（1-10 分制）和驾驶安全感知的致醉水平（0-10 分制）。大约 24%、38%、13%和 24%的受访者在过去一个月中分别有 0、1-9、10-19 和 20-30 天的 DUIC。在这四个 DUIC 频率组中，中位数典型致醉水平差异不大（5-6），但驾驶安全感知的致醉水平差异很大（3-8）。较高的驾驶安全感知致醉水平与频繁的 DUIC 相关（Spearman's rho：0.46）。驾驶安全感知致醉水平每增加一个单位，过去一个月 DUIC 的几率增加 18%至 68%（多项逻辑回归比值比-MOR：1.18，95%CI：1.13-1.23；MOR：1.40，95%CI：1.30-1.50；MOR：1.68，95%CI：1.57-1.80）。在这个有针对性的过去一个月大麻使用者样本中，DUIC 的频率差异很大，但每日/接近每日 DUIC 很常见（24%）。测量驾驶安全感知致醉水平可以划分过去一个月 DUIC 的频率。该指标有可能成为公共卫生预防工具的一个组成部分。
