what was patient 28966 last height until 3 months ago?
select chartevents.valuenum 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 = 28966 ) ) and chartevents.itemid in ( select d_items.itemid from d_items where d_items.label = 'admit ht' and d_items.linksto = 'chartevents' ) and datetime(chartevents.charttime) <= datetime(current_time,'-3 month') order by chartevents.charttime desc limit 1