How did psychologists decide which MMPI items belong on the schizophrenia scale?

Question

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Psychologists used questions that people with schizophrenia answered differently from others to determine which MMPI items belong on the schizophrenia scale. They identified specific patterns of responses that tended to be more common among people with schizophrenia, such as distrust of others, unusual experiences, and difficulty with social interaction.

How Did Psychologists Decide Which MMPI Items Belong on the Schizophrenia