Schizophrenics Mental illness 56 Catatonia 35 Diagnosis 35 Schizophrenia 29 Diagnostic and statistical manual of mental disorders 28 International statistical classification of diseases and related health problems 28 Classification 21 Delusions 16 Echolalia 10 Mental health 7 Nosology 7 Study and teaching 7 Tic disorders 5 Erotomania 4 Megalomania 4 Thought insertion 4 Family relationships 1 Mentally ill 1 Psychology 1 Psychology, Experimental 1 Schizotypal personality disorder 1