Thirty-day death or MI was less frequent among patients with non-obstructive CAD ( 2.2 % ) versus obstructive CAD ( 13.3 % ) ( OR ( adj ) 0.15 ; 95 % CI , 0.11-0 .20 ) ; 30-day death or spontaneous MI and six-month mortality were also less frequent among patients with non-obstructive CAD ( OR ( adj ) 0.19 ( 0.14-0 .25 ) and 0.37 ( 0.28-0 .49 ) , respectively ) .