Table 2

Influence of maternal characteristics on infant’s birthweight assessed by the crude and adjusted coefficient ß in linear regression (n=539)
Maternal characteristics continuous and binary ß crude SE P-value ß*adjusted SE P-value
BMI** 42.7 6.0 <0.001
Gestational age, week** 191.0 9.2 <0.001
Age < 20 or > 30 years −34.2 56.7 0.547 −11.43 41.3 0.783
Low education, ≤ 12 years −279.7 91.7 0.002 −155.3 67.2 0.021
Not married −148.9 64.7 0.022 −87.1 47.2 0.066
Parity 2nd and more 49.5 55.0 0.368 90.8 39.9 0.023
Miscarriage 15.2 69.7 0.828 4.0 50.8 0.937
Previous preterm −400.1 135.2 0.003 82.5 100.0 0.409
Maternal stress −94.7 70.7 0.181 5.4 51.6 0.916
Blood pressure > 120/80 mm/Hg 189.4 76.6 0.014 87.5 59.0 0.139
Maternal smoking −114.9 76.1 0.132 −137.0 55.2 0.013
Parental smoking −86.9 55.0 0.115 −93.3 40.1 0.020
GSTT1 null vs present −104.1 72.7 0.153 −72.7 52.7 0.170
GSTM1 null vs present −25.3 55.1 0.646 −26.0 40.0 0.516
GSTT1 null & smoking −207.0 138.9 0.137 −211.8 100.8 0.036
GSTM1 null & smoking −60.4 113.3 0.594 −150.2 82.4 0.069
GSTT1 & GSTM1 null and smoking −294.0 194.4 0.131 −340.4 141.2 0.016

ß represent the difference in mean birthweight for maternal characteristics in each row.

ß*adjusted for body mass index, gestational age and loss outlier.

**Continuous variable.

SE standard error of the difference between the means.

Excluded outliers.

Danileviciute et al.

Danileviciute et al. BMC Pregnancy and Childbirth 2012 12:161   doi:10.1186/1471-2393-12-161

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