[Table/Fig-7]:
Univariate and multivariate linear regression of neonatal birth outcomes: birth weight (kg), length (cm) and head circumference (cm) (dependant variable) with maternal haemoglobin (g/dL) (independent variable) and other significant maternal, confounders
| Variables | Model 1Birth Weight (kg) | Model 2Length (cm) | Model 3Head Circumference (cm) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Co-efficient | p-value | 95%CI | Co-efficient | p-value | 95%CI | Co-efficient | p-value | 95%CI | |
| Univariate Analysis | |||||||||
| Maternal Haemoglobin* (g/dL) | 0.072 | 0.004 | 0.02-0.12 | 0.655 | 0.010 | 0.15-1.15 | 0.306 | 0.003 | 0.10-0.50 |
| Multivariate Analysis | |||||||||
| Maternal Haemoglobin* (g/dL) | .043 | 0.05 | 0.000-0.086 | .265 | 0.230 | -0.171-0.720 | 0.152 | 0.082 | -0.019-0.324 |
| Parity (ranking increasing order) | .132 | 0.05 | -0.005-0.270 | 1.491 | 0.034 | 0.113-2.868 | 0.348 | 0.206 | -0.194-0.981 |
| Gestational age (weeks) | 0.094 | <0.001 | 0.061-0.127 | 0.986 | <0.001 | 0.657-1.316 | 0.464 | <0.001 | 0.334-0.594 |
| Interval between last and index pregnancy (yrs) | 0.019 | 0.606 | -0.056-0.095 | -0.416 | 0.278 | -1.174-0.341 | -0.028 | 0.850 | -0.327-0.270 |
| Body Mass Index (kg/m2) | 0.12 | 0.455 | -.0.020-0.046 | -0.059 | 0.729 | -0.396-0.278 | 0.005 | 0.933 | -0.127-0.138 |
| Maternal systolic blood pressure (mm/Hg) | .009 | 0.108 | -0.002-0.020 | 0.112 | 0.05 | -0.001-0.225 | 0.014 | 0.519 | -0.030-0.059 |
| Maternal diastolic blood pressure (mm/Hg) | -0.005 | 0.181 | -0.014-0.002 | -0.040 | 0.363 | -0.124-0.046 | -0.005 | 0.750 | -0.038-0.028 |
*Maternal haemoglobin taken as a continuous variable (g/dL); As birth outcomes are dependent on maternal haemoglobin and other confounders, thus birth weight, length and head circumference considered as dependent variables whereas maternal haemoglobin as independent variable; Multivariate linear regression: adjusted only for those maternal confounders who were found to be statistically significant tested either by Student’s independent t-test and/or Pearson’s correlation
Model1: Univariate Analysis Linear regression analysis associating neonatal birth weight (dependent variable) with maternal haemoglobin (g/dL);Multivariate Analysis Linear regression analysis associating neonatal birth weight (dependent variable) with maternal haemoglobin (independent variable) with other significant confounders; Model 2: Univariate Analysis Linear regression analysis associating neonatal birth length (dependent variable) with maternal haemoglobin (g/dL); Multivariate Analysis Linear regression analysis associating neonatal birth length (dependent variable) with maternal haemoglobin (independent variable) with other significant confounders; Model 3: Univariate Analysis Linear regression analysis associating neonatal birth head circumference (dependent variable) with maternal haemoglobin (g/dL);Multivariate Analysis Linear regression analysis associating neonatal birth head circumference (dependent variable) with maternal haemoglobin (independent variable) with other significant confounders