SPAZ reduced LBW ( risk ratio -LSB- RR -RSB- : @ , @ % CI : @-@ @ , P = @ ; absolute risk reduction ( ARR ) : @ % , @ % CI : @-@ @ ; number needed to treat : @ ) , and preterm delivery ( @ , @ % CI : @-@ @ , P = @ ) , and increased mean birthweight ( @ g , @ % CI : @-@ @ , P = @ ) .