Table 1 Operational definition of variables

Dependent

Pneumonia

Discrete

Does the infection patient acquire pneumonia during hospitalization? Yes or No.

Independent

Gender

Discrete

Gender of the patients, Male or Female.

Age

Continuous

Age (in years) during hospitalization

Clozapine use

Discrete

Have taken clozapine? Yes or No

Drug-drug interaction

Discrete

Has the patient taken Clozapine with Fluoxetine/Carpine/Depatec at the same time?

Coughing

Discrete

Does the patient have coughs? Yes or No.

Dosage

Continuous

The amount of medication taken by patients.

Duration of medication

Continuous

The total days patients took Clozapine.

Change of leukocyte count

Continuous

The difference of leukocyte count between start hospitalization and reported as infection.

Change of neutrophil count

Continuous

The difference of neutrophil count between start hospitalization and reported as infection.

Change of blood sugar level

Continuous

The difference of blood sugar between start hospitalization and reported as infection.

Change of weight

Continuous

The difference of body weight between start hospitalization and reported as infection.