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[null,"Table 1. Characteristics of participants"]
[]
[{"$nulls":3},"FT-NBW infans",null,"FT-LBW infans",null,"P value"]
[]
[null,"N",null,"    361",null,"    25"]
[]
[null,"Age, years",null,"31.8 ± 5.1",null,"33.8 ± 5.7",null,0.06]
[]
[null,"Primipara",null,"180 (49.9)",null,"10 (40.0)",null,0.34]
[]
[null,"Height, cm",null,"158.6 ± 5.8",null,"156.4 ± 4.3",null,0.07]
[]
[null,"Pre-pregnancy body mass index, kg/m2",null,"21.0 ± 2.9",null,"19.7 ± 2.1",null,0.044]
[]
[null,"Gestational weight gain, kg",null,"  10.0 ± 4.0",null,"  8.6 ± 3.7",null,0.08]
[]
[null,"Household income, yen"]
[null,"  < 2 million",null,"11 (3.0)",null,"1 (4.0)",null,0.98]
[null,"  2-6 million",null,"211 (58.4)",null,"15 (60.0)"]
[null,"  ≥ 6 million",null,"114 (31.6)",null,"7 (28.0)"]
[null,"  unknown",null,"25 (6.9)",null,"2 (8.0)"]
[]
[null,"Educational level"]
[null,"　Junior high school",null,"6 (1.7)",null,"1 (4.0)",null,0.24]
[null,"　High school",null,"65 (18.0)",null,"7 (28.0)"]
[null,"　Some college",null,"135 (37.4)",null,"11 (44.0)"]
[null,"　University",null,"155 (42.9)",null,"6 (24.0)"]
[]
[null,"Infants"]
[null,"  Gender, female",null,"161 (44.6)",null,"17 (68.0)",null,0.023]
[null,"  Gestational day, week",null,"39.0 ± 1.1",null,"37.8 ± 0.7",null,"<0.001"]
[null,"  Birth weight, g",null,"3,056 ± 316",null,"2,362 ± 136",null,"<0.001"]
[]
[]
[null,"Data is represented as n (%) or mean ± standard deviation.\nP values were determined using Chi-square test for categorical variables and independent student’s t-test for continuous variables. P <.05 was considered significant.\nAbbreviations: FT-NBW, full-term normal birth weight; FT-LBW, full-term low birth weight"]