A QUESTIONNAIRE FOR THE MEASUREMENT OF PARANOIA SUSPICIOUSNESS/

A 47-item Paranoia/Suspiciousness Questionnaire was developed on a non psychiatric sample using modified items from several established scale s of paranoia and related concepts. Factor analysis of the questionnai re identified five moderately correlated subscales labelled Interperso nal Suspiciousness/Hostility, Negative Mood/Withdrawal, Anger/Impulsiv eness, Mistrust/Wariness and Perceived Hardship/Resentment. There were no significant differences between males and females on the questionn aire or any of the subscales. The full questionnaire and the subscales showed satisfactory internal consistency and test-retest reliability. Further research is needed to establish the scale as a useful diagnos tic tool.