The SPQ is a 74-item scale measuring schizotypal personality traits. Some references are below:

• Hodgekins, J., Coker, S., Freeman, D., Ray-Glover, K., Bebbington, P., Garety, P.,. . . Fowler, D. (2012). Assessing levels of subthreshold psychotic symptoms in the recover phase: The Schizotypal Symptoms Inventory (SSI). Journal of Experimental Psychopathology, 3, 582-593.
• Raine, A., Reynolds, C., Lencz, T., Scerbo, A., Triphon, N.,& Kim, D. (1994). Cognitive-Perceptual, Interpersonal, and Disorganized Features of Schizotypal Personality. Schizophrenia Bulletin, 20, 191-201.

Citation reference:

• Raine, A. (1991). The SPQ - a Scale for the Assessment of Schizotypal Personality Based on DSM-III-R Criteria. Schizophrenia Bulletin, 17, 555-564.

Responses on the SPQ are a yes or no endorsement.

The scale was originally designed to measure the nine symptoms of schizotypal features:

• Ideas of reference (items 1, 10, 19, 28, 37, 45, 53, 60, 63)
• Excessive Social Anxiety (items 2, 11, 20, 29, 38, 46, 54, 71)
• Odd beliefs or magical thinking (items 3, 12, 21, 30, 39, 47, 55)
• Unusual perceptual experiences (4, 13, 22, 31, 40, 48, 56, 61, 64)
• Odd or eccentric behaviour (items 5, 14, 23, 32, 67, 70, 74)
• No close friends (items 6, 15, 24, 33, 41, 49, 57, 62, 66)
• Odd speech (7, 16, 25, 34, 42, 50, 58, 69, 72)
• Constricted affect (items 8, 17, 26, 35, 43, 51, 68, 73)
• Suspiciousness / paranoid ideation (items 9, 18, 27, 36, 44, 52, 59, 65)

All 74 items can also be summed for a total SPQ sum score. Higher scores indicate more schizotypal symptoms.