Table 2 Incidences of adverse pregnancy outcomes in women with appropriate gestational weight gain according to the ROC, IR, and IOM targets

Adverse pregnancy outcome	Pregnant women with appropriate gestational weight gain
	ROC targets (N=477)	IR targets (N=859)	IOM targets (N=560)	P value from Chi-squared tests*
	n (%)	n (%)	n (%)	P value from Chi-squared tests*
Premature delivery	23 (4.8)	39 (4.5)^†	23 (4.1)	0.85
Macrosomia	17 (3.6)	51 (5.9)^†	22 (3.9)	0.08
Full-term low birth weight	4 (0.8)	5 (0.6)	4 (0.7)	0.86
LGA	38 (8.0)	93 (10.8)^†	43 (7.7)	0.08
SGA	36 (7.5)^†	69 (8.0)^†	48 (8.6)	0.83
Neonatal respiratory distress syndrome	1 (0.2)	1 (0.1)	1 (0.2)	1.00**
Pregnancy hypertension	60 (12.6)^†	125 (14.6)^†	79 (14.1)	0.60

ROC receiver operating characteristic, IR interquartile range, IOM Institute of Medicine, LGA large for gestational age, SGA small for gestational age
*P values from chi-squared tests of differences in the incidences of adverse pregnancy outcomes among the three groups
**P values from Fisher’s exact tests
^†P < 0.05 from McNemar’s chi-squared paired tests compared with the incidence of adverse pregnancy outcomes among pregnant women who exhibited appropriate weight gain according to the IOM targets

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