After 24 wk , children who received MNs + FO had a L : M of -0.09 ( -0.03 , -0.15 ; P = 0.001 ) ; children receiving only MNs had a L : M of -0.11 ( -0.02 , -0.20 ; P = 0.001 ) , and the C group had L : M of -0.07 ( 0.02 , -0.16 ) ; P = 0.002 ) .