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5.7 Adaptation and validation of the Impaired Control Scale (ICS) for use with heroin addicts
The ICS was chosen for use in the present study as a concurrent measure of a central component of dependence that is consistent with the psychological understanding of the dependence phenomenon. At the time of making the choice of instruments for the study, the ICQ (Stockwell et al. 1994) for which significant correlations with the ICS were demonstrated in the above mentioned study and which is much easier to administer, consisting as it does of five items rather than twenty five, was not yet in the public domain. The ICS was validated in general and treatment populations of alcohol drinkers and therefore required adaptation and validation of the scale for populations of heroin users.
5.7.1 Study 3 and the samples used in it
The study conducted for the purpose of adapting the ICS and validating the adapted scale, the ICSdrg, was Study 3 (adaptation and validation) outlined in Chapter 4. In this study, adaptation and validation of the Coping Behaviours Inventory, described below in Chapter 6, were also conducted. In total, four separate samples were used in Study 3 and three of these were used for the purpose of adapting the ICS and validating the ICSdrg: Sample 3 was recruited for the purpose of checking the items for the adapted ICS, the ICSdrg; Sample 4 was recruited for the purpose of validating the adapted scale (as well as for the purpose of validating the adapted CBI described in Chapter 6), and Sample 5 was recruited for the test retest reliability study of both adapted instruments. These samples were named and described briefly in Chapter 4. Instruments administered to each of the samples in the study are presented in Table 5.1 below.
5.7.2 The study site
Samples 3, 4 and 5, used for the adaptation of the ICS, the validation and test of reliability of the adapted version were recruited at the Leeds Addiction Unit, described above in Chapter 4, during routine attendances at the clinic room where pharmacological treatments are dispensed and monitored, and at out-patient clinics.
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