Sidak 's adjustment showed no significant difference in effect size ( the difference in average response in millimeters ) between the active and passive self-ligating brackets ( the results are presented as effect size , 95 % confidence intervals , probabilities , and intraclass correlation coefficients ) ( -0.42 [ -1.32 , 0.48 ] , 0.600 , 0.15 ) , but the conventional bracket was significantly different from both of these ( -1.98 [ -3.19 , -0.76 ] , 0.001 , 0.15 ; and -1.56 [ -2.79 , -0.32 ] , 0.001 , 0.15 ) .