instruction: what is patient 021-114154's first systemicmean until 05/02/2101?
response: SELECT 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 = '021-114154')) AND NOT vitalperiodic.systemicmean IS NULL AND STRFTIME('%y-%m-%d', vitalperiodic.observationtime) <= '2101-05-02' ORDER BY vitalperiodic.observationtime LIMIT 1