From http://www.openvpms.org/project/add-patient-weight-reminder-export :
This project will extend the reminder CSV export support to include three new columns, "Patient Weight", "Patient Weight Units" and "Patient Weight Date". These will:
contain the last recorded weight, units and weigh date of the patient
be blank, if the patient has not been weighed
To limit the impact to practices already using the reminder export support, the columns will be added after the existing columns.