National Drug Research Institute, Curtin University, Perth, Western Australia, Australia.
Addiction. 2012 Mar;107(3):650-7. doi: 10.1111/j.1360-0443.2011.03673.x.
To determine whether declines in the prevalence of cannabis use in Australia have been accompanied by changes in age of onset of cannabis use.
A retrospective cohort study. To account for right censoring error we contrasted the mean age of onset for comparable age groups across the four surveys conducted from 1998 to 2007. Kaplan-Meier failure graphs were used to describe how the cumulative risk of first use of cannabis varied across birth cohorts born from 1947 to 1993.
Australian data collected in the nationally representative, triennial, National Drug Strategy Household Surveys (NDSHS) PARTICIPANTS: A total of 88,268 Australian household residents aged 14 years and older.
Life-time use of cannabis and age of first use.
For respondents under the age of 20 years, mean age of first use of cannabis has increased from 14.6 years in 1998 to 15.2 years in 2007.
The decline in cannabis use prevalence that has occurred since 1998 in Australia has been accompanied by an increase in age of first use among those aged under 20 years.
确定澳大利亚大麻使用流行率的下降是否伴随着大麻使用起始年龄的变化。
回顾性队列研究。为了解决右删失误差问题，我们对比了在 1998 年至 2007 年进行的四次调查中，可比年龄组的大麻起始年龄的平均值。Kaplan-Meier 失效图用于描述 1947 年至 1993 年出生的不同出生队列中首次使用大麻的累积风险如何变化。
澳大利亚全国代表性的三年一次的国家药物策略家庭调查（NDSHS）中收集的数据。
共有 88268 名年龄在 14 岁及以上的澳大利亚家庭居民。
大麻终身使用和首次使用年龄。
对于年龄在 20 岁以下的受访者，大麻的首次使用平均年龄从 1998 年的 14.6 岁增加到 2007 年的 15.2 岁。
自 1998 年以来，澳大利亚大麻使用流行率的下降伴随着 20 岁以下人群首次使用大麻年龄的增加。
