is there any microbiological test result for patient 1918's blood culture until 1 year ago?
select count(*)>0 from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 1918 ) and microbiologyevents.spec_type_desc = 'blood culture' and datetime(microbiologyevents.charttime) <= datetime(current_time,'-1 year')