NSSI history predicted both incident SAs ( hazard ratio [ HR ] = 5.28 , 95 % confidence interval [ CI ] = 1.80-15 .47 , z = 3.04 , p = .002 ) and incident NSSI ( HR = 7.31 , z = 4.19 , 95 % CI = 2.88-18 .54 , p < .001 ) through week 24 , and was a stronger predictor of future attempts than a history of SAs ( HR = 1.92 , 95 % CI = 0.81-4 .52 , z = 2.29 , p = .13 ) .
