The effect of the 2009 revised U.S. guidelines for gestational weight gain on maternal and infant health: a quasi-experimental study

Table 3 Effect of 2009 IOM revised GWG guidelines on maternal and infant outcomes

	Effect of IOM Revised Guidelines (95% CI)
	Main Analysis: Post Period July 2010	Secondary analysis: Post Period October 2010
Gestational weight gain, lbs	−0.20	−0.19
Gestational weight gain, lbs	(−0.47, 0.07)	(−0.46, 0.08)
Gestational diabetes	0.09	0.32
Gestational diabetes	(−0.50, 0.68)	(−0.27, 0.90)
Preterm birth	−1.19*	−1.27*
Preterm birth	(−1.86, − 0.52)	(−1.94, − 0.61)
Low birthweight	−1.38*	−1.46*
Low birthweight	(−2.07, − 0.70)	(−2.14, −.78)
Very low birth weight	−1.30*	− 1.32*
Very low birth weight	(− 1.68, − 0.92)	(− 1.69, − 0.95)

Values in table represent the coefficients on the interaction term between a binary variable for whether a pregnancy occurred during the post-period (i.e., on or after July 2010) and a binary variable for whether a woman’s pre-pregnancy body mass index was categorized as overweight versus obese. Coefficients for binary outcomes were multiplied by 100 and therefore represent a change in percentage points. Analysis involved multivariable linear models (i.e., linear probability models for binary outcomes). Covariates included women’s age, race/ethnicity, education, marital status, insurance for prenatal care, parity, household income in the year prior to delivery, and delivery year
Abbreviations: GWG Gestational weight gain, IOM Institute of Medicine
* p < 0.05

ISSN: 1471-2393