Effects of Maternal Factors on Birth Weight in Japan

Table 2

Factors affecting the birth weight as determined by a multiple regression analysis (total).

	Partial regression coefficient	𝑃
Gestational age at delivery (/wks)	160.081 (158.141–161.171)	<0.0001
Primiparity (yes versus no)	−104.796 (−112.232–−101.248)	<0.0001
Cesarean delivery (yes versus no)	−2.046 (−7.938–6.019)	0.787
Weight gain during pregnancy (kg)	16.269 (15.479–16.741)	<0.0001
Female gender	−107.150 (−112.585–−102.231)	<0.0001
Induction of labor; (yes versus no)	9.714; (5.483–18.734)	<0.0001
Pregestational BMI (/1)	22.250 (21.264–22.875)	<0.0001
IVF-ET (yes versus no)	37.404 (17.161–46.538)	<0.0001
Smoking habit (yes versus no)	−107.593 (−118.235–−93.763)	<0.0001
Maternal height (/cm)	10.270 (9.908–10.864)	<0.0001
Maternal age (year)	2.752 (2.117–3.188)	<0.0001