instruction: what is the monthly average of wound 1 neg pressure vac drainage amount output of patient 015-94542 until 2017 days ago?
response: SELECT AVG(intakeoutput.cellvaluenumeric) FROM intakeoutput WHERE intakeoutput.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '015-94542')) AND intakeoutput.celllabel = 'wound 1 neg pressure vac drainage amount' AND intakeoutput.cellpath LIKE '%output%' AND DATETIME(intakeoutput.intakeoutputtime) <= DATETIME(CURRENT_TIME(), '-2017 day') GROUP BY STRFTIME('%y-%m', intakeoutput.intakeoutputtime)