Chunk #5 — Methods — Measures and Instruments — Verification of self-reports of drinking

Source: Changing network support for drinking: network support project 2-year follow-up.
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Collateral reports were used for one-third of participants (randomly selected) to verify self-reports of use vs. non-use of substances. Agreement between collaterals and patients regarding drinking at months 18 and 24 was kappa > .90 (p < .001).