microcephaly was present in 12 of 56 ( 21.4 % ) infants whose mothers used cocaine during pregnancy ( x2 = 5.96 , p less than .01 ) , and 15 of 56 ( 26.7 % ) had intrauterine growth retardation ( x2 = 9.53 , p less than .01 ) compared with the control infants ( 2 of 5 [ 3.5 % ] and 3 of 56 [ 5.3 % ] , respectively ) .
C0009170
cocaine
C0032961
pregnancy