Compared with the control group , boys in the low-poverty voucher group had significantly increased rates of major depression ( 7.1 % vs 3.5 % ; odds ratio ( OR ) , 2.2 [ 95 % CI , 1.2-3 .9 ] ) , PTSD ( 6.2 % vs 1.9 % ; OR , 3.4 [ 95 % CI , 1.6-7 .4 ] ) , and conduct disorder ( 6.4 % vs 2.1 % ; OR , 3.1 [ 95 % CI , 1.7-5 .8 ] ) .