how much does the average hospital bill include lipase, ascites until 2102?
select avg(t1.c1) from ( select sum(cost.cost) as c1 from cost where cost.hadm_id in ( select labevents.hadm_id from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'lipase, ascites' ) ) and strftime('%y',cost.chargetime) <= '2102' group by cost.hadm_id ) as t1