Influence of weight gain, according to Institute of Medicine 2009 recommendation, on spontaneous preterm delivery in twin pregnancies

Table 5 Effect of weight gain on the secondary outcomes estimated by logistic regression

	At least one twin SGA^a OR(95%CI)	Hypertensive gestational disorders OR(95%CI)	Gestational diabetes mellitus OR(95%CI)	Neonatal adverse outcomes^b OR(95%CI)
Under vs. normal	1.01 (0.45; 2.28)	0.39 (0.15; 1.05)	1.98 (0.75; 5.22)	0.94 (0.29; 3.05)
Over vs. normal	–	7.69 (1.94; 30.47)	–	0.44 (0.05; 3.82)

The model for “neonatal adverse outcomes” was adjusted for pre-pregnancy BMI and gestational age. All the other models were adjusted only for pre-pregnancy BMI
^aSGA = small for gestational age; ^bAdverse outcomes = neonatal resuscitation, respiratory distress syndrome, disseminated intravascular coagulation, intra-ventricular hemorrhage, leucomalacia, sepsis, necrotic enteritis, retinopathy of prematurity

ISSN: 1471-2393