what percentile is the anion gap of 12.0 for patients of the same age as patient 97330 in their current hospital encounter?
select distinct t1.c1 from ( select labevents.valuenum, percent_rank() over ( order by labevents.valuenum ) as c1 from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'anion gap' ) and labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.age = ( select admissions.age from admissions where admissions.subject_id = 97330 and admissions.dischtime is null ) ) ) as t1 where t1.valuenum = 12.0