reported their frequency of use of these substances on a 6-point range from “never” to “(nearly) every day.” The number of categories of substances used weekly or more were added to create a continuous measure of the breadth of drug use. Domains assessed by the above covariates have been shown to be associated with suicidal behavior among substance abusers (Conner et al., 2007a; Ilgen, Harris, Moos, & Tiet, 2007).
