instruction: on the first icu visit, list the daily maximum systemicmean of patient 006-195541.
response: SELECT MAX(vitalperiodic.systemicmean) FROM vitalperiodic WHERE vitalperiodic.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '006-195541') AND NOT patient.unitdischargetime IS NULL ORDER BY patient.unitadmittime LIMIT 1) AND NOT vitalperiodic.systemicmean IS NULL GROUP BY STRFTIME('%y-%m-%d', vitalperiodic.observationtime)