Reliability and validity of the Westminster Substance Use Questionnaire among Lancashire adolescents.

The reliability and validity of the Westminster Substance Use Questionnaire (WASQ) was examined in a pilot study involving a sample of secondary school pupils in Blackburn borough, Lancashire, UK. The questionnaire performed well on all the indices tested and the findings of the exercise facilitated a fairly accurate and meaningful interpretation of the prevalence data obtained in the main study. The instrument is thus recommended for use in adolescent substance use surveys in the UK and elsewhere although further validation or slight modification may be necessary to suit local needs.