instruction: what the first height of patient 016-14568 until 36 months ago.
response: SELECT patient.admissionheight FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '016-14568') AND NOT patient.admissionheight IS NULL AND DATETIME(patient.unitadmittime) <= DATETIME(CURRENT_TIME(), '-36 month') ORDER BY patient.unitadmittime LIMIT 1