Post hoc subgroup analysis showed a potential treatment effect of allopurinol on the proportion of infants with a cord S@ value above the @th percentile in girls ( ALLO n = @ ( @ % ) vs CONT n = @ ( @ % ) ; risk ratio ( RR ) @ ( @ % CI @ to @ ) ) but not in boys ( ALLO n = @ ( @ % ) vs CONT n = @ ( @ % ) ; RR @ ( @ % CI @ to @ ) ) .