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Table 2 Incidence of the primary outcomes in the weight gain groups

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

 

Under (n. 91)

Normal (n. 73)

p-value§

Over (n. 11)

Normal (n. 73)

p-value§

Preterm delivery < 37 weeks

61 (67.0%)

29 (39.7%)

P = .002

9 (81.8%)

29 (39.7%)

P = .04

Early preterm delivery < 34 weeks

23 (25.3%)

5 (6.8%)

P = .005

3 (27.3%)

5 (6.8%)

P = .13

  1. Results are reported as numbers and percentages. The p-value of an overall test (Chi-square test) correlating the three groups for the two by two comparison
  2. Italic data are statistically significant
  3. §Fisher’ exact test with Holm-Bonferroni correction