intake assessment) or used since the previous assessment (at each follow-up) recreationally. This approach is useful in this context as it retains variance at all ages (which is especially challenging when dealing with the relatively low usage rates among 11-year-olds). Additionally, the analysis of less quantitatively-specific responses may increase reliability, especially when participants are asked about use over a longer period of time (Hays & Huba, 1988).
