Compared with durable polymer SES , the noninferiority of SES with biodegradable polymer coating was established by an absolute risk difference of 0.9 % in the primary end-point ( 12.4 % vs. 13.3 % , P = 0.67 ) and an upper limit of one-sided 95 % confidence interval ( CI ) of 2.96 % ( P for noninferiority = 0.001 ) .