EFFECT ON THE NEWBORN
Figures 4 to 6 present the fractions of PTB, SGA and
LGA births that were attributable to specific BMI and
GWG categories. For PTB and SGA, the contribution
of prenatal smoking—a recognized risk factor for these
outcomes—is compared.
• Above recommended GWG contributed to
18.2% of PTB, while underweight BMI, belowrecommended
GWG and smoking in the third
trimester each contributed to less than 5% of PTB.
• Below recommended GWG contributed more
(9.2%) to SGA births than prenatal smoking (8.7%)
or underweight BMI (5.3%).
• Above recommended GWG contributed more
(15.9%) to LGA births than being overweight (6.5%)
or obese (8.9%).
The risks associated with smoking during pregnancy
are well known. It is therefore noteworthy that maternal
weight in general, and GWG in particular, contributed
more to adverse infant outcomes than prenatal
smoking. The contributions of high BMI and excess
GWG in particular, are likely to increase as population
rates of overweight and obesity rise.
EFFECT ON THE NEWBORNFigures 4 to 6 present the fractions of PTB, SGA andLGA births that were attributable to specific BMI andGWG categories. For PTB and SGA, the contributionof prenatal smoking—a recognized risk factor for theseoutcomes—is compared.• Above recommended GWG contributed to18.2% of PTB, while underweight BMI, belowrecommendedGWG and smoking in the thirdtrimester each contributed to less than 5% of PTB.• Below recommended GWG contributed more(9.2%) to SGA births than prenatal smoking (8.7%)or underweight BMI (5.3%).• Above recommended GWG contributed more(15.9%) to LGA births than being overweight (6.5%)or obese (8.9%).The risks associated with smoking during pregnancyare well known. It is therefore noteworthy that maternalweight in general, and GWG in particular, contributedmore to adverse infant outcomes than prenatalsmoking. The contributions of high BMI and excessGWG in particular, are likely to increase as populationrates of overweight and obesity rise.
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