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Table 3 Multivariate models explaining birth weight at 1st, 2nd and 3rd trimester by use of various explanatory variables

From: Maternal fat free mass during pregnancy is associated with birth weight

Included variables in model

R 2

β

Standardized β

t

P-value

sr

1st trimestera

 FFM

0.24

44.47

0.35

5.16

<0.001

0.35

2nd trimesterb

 FFM

0.19

30.72

0.22

5.83

<0.001

0.19

 Pre-pregnancy BMI

 

16.16

0.11

2.91

0.004

0.09

 Gestational age

 

11.35

0.07

2.24

0.025

0.07

3rd trimesterc

 FFM

0.12

68.3

0.38

3.31

0.002

0.38

  1. Abbreviations: R 2, standardised coefficients of determination; β, unstandardised multiple regression coefficients; sr, semipartial correlations
  2. aNo effect of maternal age, maternal pre-pregnancy BMI, BMI at the tested time, gestational age and FM
  3. bNo effect of maternal age, BMI at the tested time and FM
  4. cNo effect of maternal age, maternal pre-pregnancy BMI, BMI at the tested time, gestational age and FM