Table 2.

Bivariate correlations among birth weight and maternal body compositions and other related covariates in three trimesters

Variable	1	2	3	4	5	6	7	8
First trimester group (n = 348)
1 Birth weight	—	0.52**	0.15*	0.23**	0.23**	0.35**	0.23**	0.27**
2 Placental weight		—	0.10	0.13	0.16*	0.27**	0.18*	0.21**
3 GWG at delivery			—	−0.29**	−0.15*	0.03**	−0.15*	−0.13
4 Pre-pregnancy BMI				—	0.92**	0.54**	0.88**	0.85**
5 Pregnancy BMI					—	0.62**	0.88**	0.85**
6 FFM						—	0.98**	0.95**
7 PBF							—	0.98**
8 FM								—
Second trimester group (n = 481)
1 Birth weight	—	0.55**	0.18**	0.24**	0.25**	0.28**	0.26**	0.28**
2 Placental weight		—	0.13**	0.20**	0.21**	0.23**	0.22**	0.24**
3 GWG at delivery			—	0.12**	0.05	0.11**	0.06	0.06
4 Pre-pregnancy BMI				—	0.90**	0.54**	0.88**	0.85**
5 Pregnancy BMI					—	0.62**	0.88**	0.84**
6 FFM						—	0.68**	0.76**
7 PBF							—	0.98**
8 FM								—
Third trimester group (n = 321)
1 Birth weight	—	0.61**	0.15**	0.09*	0.12	0.38**	0.15	0.20
2 Placental weight		—	0.03	0.12	0.11	0.15	0.11	0.10
3 GWG at delivery			—	0.05	0.36**	0.33**	0.43**	0.48**
4 Pre-pregnancy BMI				—	0.81**	0.34**	0.81**	0.78**
5 Pregnancy BMI					—	0.45**	0.87**	0.81**
6 FFM						—	0.56**	0.66**
7 PBF							—	0.98**
8 FM								—

Note: Correlations marked with an asterisk (*) were significant at P < 0.05

Correlations marked with two asterisks (**) were significant at P < 0.01