instruction: until 04/2102, what was the daily average weight of patient 002-39753?
response: SELECT AVG(patient.admissionweight) FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '002-39753') AND NOT patient.admissionweight IS NULL AND STRFTIME('%y-%m', patient.unitadmittime) <= '2102-04' GROUP BY STRFTIME('%y-%m-%d', patient.unitadmittime)