Psychometric evaluation of the treatment entry questionnaire to assess extrinsic motivation for inpatient addiction treatment.

Readiness to quit had small but significant positive correlations with identified regulation for each of the substances measured (rs = 0.118 – 0.262, all p s < 0.05), and small but highly significant negative correlations with external regulation for alcohol ( r = −0.119, p < 0.001) and stimulants ( r = −0.178, p < 0.001).

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