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Table 6 Significant factors in the multinomial logistic regression for GWG under, within (reference category) and above IOM recommendations

From: A retrospective study of gestational weight gain in relation to the Institute of Medicine’s recommendations by maternal body mass index in rural Pennsylvania from 2006 to 2015

Parameter Odds ratio Standard error 95% confidence interval
Under recommendations versus within recommendations
 Maternal BMI 1.041 0.004 1.034–1.048
 Age at conception 0.987 0.005 0.978–0.996
 First birth 0.617 0.053 0.521–0.731
 Second birth 0.794 0.042 0.716–0.879
 Gestation length 0.989 0.003 0.982–0.995
 Systolic blood pressure 1.001 0.002 0.998–1.005
Over recommendations versus within recommendations
 Maternal BMI 1.030 0.003 1.024–1.036
 Age at conception 0.998 0.004 0.991–1.006
 First birth 1.558 0.100 1.374–1.766
 Second birth 1.372 0.059 1.261–1.493
 Gestation length 1.016 0.003 1.010–1.021
 Systolic blood pressure 1.005 0.002 1.001–1.008