instruction: what was the first time that the respiratory rate of patient 31300 was, on 03/01/2103, less than 19.0?
response: SELECT chartevents.charttime FROM chartevents WHERE chartevents.icustay_id IN (SELECT icustays.icustay_id FROM icustays WHERE icustays.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 31300)) AND chartevents.itemid IN (SELECT d_items.itemid FROM d_items WHERE d_items.label = 'respiratory rate' AND d_items.linksto = 'chartevents') AND chartevents.valuenum < 19.0 AND STRFTIME('%y-%m-%d', chartevents.charttime) = '2103-03-01' ORDER BY chartevents.charttime LIMIT 1