However , graded inequalities by maternal education emerged in the intervention group { relative risk [ RR ] = 1.12 [ 95 % confidence interval ( CI ) : 1.04 , 1.20 ] for partial university and RR = 1.20 [ 95 % CI : 1.11 , 1.31 ] for secondary education or less vs complete university ; risk difference [ RD ] = 0.06 [ 95 % CI : 0.03 , 0.09 ] and 0.10 [ 95 % CI : 0.06 , 0.14 ] , respectively } .