title: Combination of parity and pre-pregnancy BMI and low birth weight infants among Japanese women of reproductive age.
abstract: This study aimed to examine the effects of parity and pre-pregnancy body mass index (BMI) on low birth weight (LBW) infants among Japanese women. Participants included 1,518 mothers (mean age 34.0 years) of singleton full-term infants in 2011. The incidence of LBW infants was 7.5% in primiparous women with BMI<18.5 (Group A; n=239), 4.0% in multiparous women with BMI<18.5 (Group B; n=124), 6.0% in primiparous women with 18.5≤BMI<25 (Group C; n=715), and 1.8% in multiparous women with 18.5≤BMI<25 (Group D; n=440). A multivariable logistic regression model revealed that mothers in Group A were more likely to deliver a LBW infant [odds ratio (OR) 6.41, 95% confidence interval (CI), 2.65-15.49] than were mothers in Group D. Being both underweight (OR 1.8, 95% CI: 1.05-3.11) and primiparous (OR 3.41, 95% CI: 1.82-6.44) were independently associated with LBW infants. This study demonstrated that the characteristics of primiparous and underweight in mothers are additively associated with LBW infants.
authors.affiliation: Japanese Red Cross Medical Center, Tokyo, Japan.
authors.forename: Kounosuke
authors.initials: K
authors.lastname: Suzuki
authors.forename: Kyoko
authors.initials: K
authors.lastname: Nomura
authors.forename: Shinichi
authors.initials: S
authors.lastname: Takenoshita
authors.forename: Kazumichi
authors.initials: K
authors.lastname: Ando
authors.forename: Michiko
authors.initials: M
authors.lastname: Kido
mesh_terms: D000328:Adult; D015992:Body Mass Index; D005260:Female; D006801:Humans; D007230:Infant, Low Birth Weight; D007564:Japan / Q000453:epidemiology; D016015:Logistic Models; D009752:Nutritional Status; D016017:Odds Ratio; D010298:Parity; D011247:Pregnancy; D012189:Retrospective Studies; D012307:Risk Factors; D013851:Thinness / Q000453:epidemiology*