instruction: whats the first height of patient 015-76260 during their first hospital encounter?
response: SELECT patient.admissionheight FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '015-76260' AND NOT patient.hospitaldischargetime IS NULL ORDER BY patient.hospitaladmittime LIMIT 1) AND NOT patient.admissionheight IS NULL ORDER BY patient.unitadmittime LIMIT 1