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

Table 3 Incidence of the secondary outcomes in the weight gain groups

	Under (n. 91)	Normal (n. 73)	Over (n. 11)	P value^c
At least one twin SGA^a	16 (17.6%)	13 (17.8%)	0 (0%)	0.31
Both twins SGA^a	4 (4.4%)	1 (1.4%)	0 (0%)	0.43
Hypertensive disorders	7 (7.7%)	13 (17.8%)	7 (63.6%)	< 0.001
Gestational diabetes	15 (16.5%)	7 (9.6%)	0	0.18
1st twin adverse outcomes^b	20 (22.0%)	6 (8.2%)	2 (18.2%)	0.06
2nd twin adverse outcomes^b	20 (22.0%)	8 (11.0%)	2 (18.2%)	0.18

Results are reported as numbers and percentages
Italic data are statistically significant
^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; ^cFisher’s exact test with Holm-Bonferroni correction, for all comparison; ns, not significant

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