Main findings
The present study suggests that >9 h of MSD decreased the
incidence of LBW < 2,500 g and SGA but did not affect the
outcome after adjusting for excessive gestational BWG, which implies
that both long MSD and excessive gestational BWG had great impact on
decreasing the risk of LBW and SGA. Additionally, 9 to <10 h
of MSD significantly decreased the risk of LBW <2,500 g and
SGA in women with appropriate gestational BWG.