hey what was patient 27703's average c-reactive protein value the last month?
select avg(labevents.valuenum) from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 27703 ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'c-reactive protein' ) and datetime(labevents.charttime,'start of month') = datetime(current_time,'start of month','-1 month')