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Interleukin (IL)-1β in cerebrospinal fluid from healthy volunteers (mean age 25.4±7.2 years) and patients with schizophrenia (mean age 27.5±6.6 years). Each point represents the concentration of IL-1β (pg/ml) in a single cerebrospinal fluid (CSF) sample. Horizontal lines show median values for each group. The 75 percentiles are 0.97 (healthy volunteers) and 12.2 (patients with schizophrenia). P<0.0001 (Mann–Whitney U-test).
