RESULTS	No difference was recorded in the duration of gestation ( 0.2 weeks [ -0.1 to 0.4 ] ; p = 0.12 ) , infant length ( 0.3 cm [ -0.1 to 0.6 ] ; p = 0.16 ) , or head circumference ( 0.2 cm [ -0.1 to 0.4 ] ; p = 0.18 ) .\