Treatment outcome, cognitive function, and psychopathology in methamphetamine users compared to other substance users

Table 3 Study instruments

Instrument	Description	Assessment
Becks Depression Inventory-II (BDI-II) (Hautzinger et al[29], 2006)	21-question multiple-choice self-report inventory measuring the severity of depression. Raw scores were used for analyses	T0, T1
Cognitrone (Wagner and Karner[30], 2003)	Computer administered Test of cognitive working speed and working accuracy (comparisons of geometrical figures). Scores were standardized into T-values according to test norms	T0, T1
Documentation standards III for the evaluation of the treatment of dependent individuals (German Society for Addiction and Therapy[31], 2001)	Defined items to assess substance use and related factors (e.g., years of substance use, age at use onset, number of withdrawals)	T0
Hamilton Depressive Rating Scale (HAMD)(Hamilton[32], 1960)	Clinician-administered depression assessment scale, containing 17 items of symptoms of depression. Time period: past week. Assessed as a semi structured interview. Raw scores were used for analyses	T0, T1
Inventory of personal psychosocial resources(Küfner et al[33], 2006)	Self-report questionnaire measuring psychosocial resources in the past and at present based on different scales, e.g., relationship, friends, financial and work situation. A total raw score of all scales measuring the present situation was built and used for analyses	T0, T1
Mannheimer Craving Scale (Nakovics et al[34], 2009)	Self-report questionnaire with 12 multiple choice items and 4 additional items measuring Craving within the last 7 d. Raw scores from the main 12 items were used for analyses	T0, T1
NEO-Five-Factor-Inventory (NEO-FFI)(Borkenau and Ostendorf[35], 2008)	Self-report questionnaire with 60 items for the measurement of the so-called “big five” personality traits (neuroticism, extraversion, openness, agreeableness, consciousness). Scores were standardized into T-values according to test norms	T0
Raven's Standard Progressive Matrices(Raven et al[36], 2016)	Nonverbal intelligence test, Computer version. Scores were standardized into IQ values according to test norms	T0
Structured Clinical Interview for DSM-IV Axis I (Wittchen et al[37], 1997)	Diagnostic structured interview to determine the presence of DSM-IV Axis I disorders	T0
Symptom Checklist 90-R (SCL-90R) (Franke[38], 1995)	Self-report questionnaire assessing symptoms of psychopathology on different scales. For this study two scales were use: intensity of depressive symptoms scale and “Positive Symptom Distress Index” (PSDI), a measure of intensity of present symptoms. Scores of both scales were standardized into T-values according to test norms	T0, T1
Wender Utah Rating Scale -short Version (Wursk) (Retz-Junginger et al[39], 2002)	Short version (25 items including 4 control items) of a self-report questionnaire assessing retrogradely childhood symptoms of attention deficit hyperactivity disorder. Raw Scores were built from the 21 core items and used for analyses	T0