In the cohort of 2 591 pregnant women, 2 614 infants were delivered. Among them, 67 were LBW. The incidence rate of LBW infants was 2.56%.

• 2 5 91名孕妇共生产 2 614名活产儿 ,其中 67例为LBW ,LBW发生率为 2 5 6%25。