Table 4.

Univariate simple and multiple linear regression model examining the associations between maternal risk factor variables and birth weight (kg) as an outcome in Butajira Referral Hospital, Butajira, Ethiopia, 2018 (n = 337).

Maternal factors	Simple regression model				Multiple regression model
	Beta coefficient	SE	95% CI for beta coefficient	p-value	Beta coefficient	SE	95% CI for beta coefficient	p-value
Parity	0.190	0.050	0.091 to 0.289	<0.001	0.137	0.055	0.029 to 0.245	0.013
Hgb	0.088	0.017	0.053 to 0.122	<0.001	0.035	0.018	0.001 to 0.070	0.046
Total cholesterol	0.004	0.001	0.002 to 0.006	0.01	0.001	0.001	−0.001 to 0.003	0.423
Total protein	0.088	0.029	0.032 to 0.144	0.02	0.007	0.029	−0.050 to 0.064	0.822
Pre-pregnancy BMI	0.045	0.010	0.026 to 0.064	<0.001	0.043	0.010	0.023–0.064	<0.001
Weight gain	0.080	0.010	0.06 to 0.100	<0.001	0.072	0.011	0.052–0.093	<0.001

Hgb: hemoglobin; BMI: body mass index; SE: standard error; CI: confidence interval.

Numerical data in bold indicate statistical significance (p < 0.05). Multiple regression model is controlled for maternal age, residence and educational level.