Journal of Pregnancy / 2013 / Article / Tab 1

Research Article

Effects of Maternal Factors on Birth Weight in Japan

Table 1

Comparison of the perinatal/obstetrical variables between 2006 and 2010: results of the univariate analysis (total).

20062010

Number27,72338,008
Birth weight (g)2950.84 (510.24)2937.52 (505.12)<0.0001
Gestational age at delivery (wks)39.087 (1.933)38.985 (1.930)<0.0001
Maternal height (cm)158.338 (5.436)158.471 (5.492)0.006
Maternal age (yr)31.119 (5.015)32.002 (5.209)0.006
Pregestational BMI21.057 (3.347)21.092 (3.44)0.041
Weight gain during pregnancy (kg)9.846 (4.454)9.842 (4.333)0.744
IVF-ET637 (2.3%)1,672 (4.4%)<0.0001
Primiparity14,693 (53.0%)20,676 (54.4%)<0.0001
Smoking1,807 (5.3%)1,672 (4.4%)<0.0001
Induction of labor6,542 (23.6%)10,224 (26.9%)<0.0001
Cesarean delivery6,986 (25.2%)10,832 (28.5%)<0.0001

() represents the standard deviation or %.

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