Analysis 1.1. Comparison 1 Aspirin plus antipsychotics versus placebo plus antipsychotics), Outcome 1 Global state: any change-unspecified problem necessitating change in dose or type of antipsychotics-medium term.. .. . Analysis 1.2. Comparison 1 Aspirin plus antipsychotics versus placebo plus antipsychotics), Outcome 2 Mental state: 1. General-mean endpoint score (Positive and Negative Symptom Scale (PANSS) total, high = poor).. .. . Analysis 1.3. Comparison 1 Aspirin plus antipsychotics versus placebo plus antipsychotics), Outcome 3 Mental state: 2. Specific-negative symptoms-mean endpoint score (PANSS negative, high = poor).. .. .. .. .. Analysis 1.4. Comparison 1 Aspirin plus antipsychotics versus placebo plus antipsychotics), Outcome 4 Mental state: 3.