what was the daily maximum amount of t tube given to patient 4469 on the last icu visit?
select max(outputevents.value) from outputevents where outputevents.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 4469 ) and icustays.outtime is not null order by icustays.intime desc limit 1 ) and outputevents.itemid in ( select d_items.itemid from d_items where d_items.label = 't tube' and d_items.linksto = 'outputevents' ) group by strftime('%y-%m-%d',outputevents.charttime)