Table 2.
Coefficients and risk-scores of each predictor included in the model to predict low birthweight (n = 379). Figures are numbers (percentages) unless mentioned otherwise.
| Predictor Variable | Univariable Analysis | Multivariable Analysis | Simplified Risk Score | ||
|---|---|---|---|---|---|
| β (95 % CI) | P-Value | β (95 % CI) | P-Value | ||
| Age of the mother (<20) | 1.596 (0.980, 2.222) | <0.01 ¥ | 1.593 (0.856, 2.344) | <0.01 * | 2.5 |
| Marital status (single) | 0.184 (−0.779, 1.033) | 0.69 | NA | - | - |
| Formal education (no) | 0.431 (−0.072, 0.951) | 0.098 ¥ | 0.479 (−0.382, 1.384) | 0.284 | |
| BMI (<18.5) | 1.530 (1.015, 2.053) | <0.01 ¥ | 1.516 (0.915, 2.133) | <0.01 * | 2.5 |
| Height (<155cm) | 1.032 (0.535, 1.543) | <0.01 ¥ | 1.225 (0.637, 1.838) | <0.01 * | 2 |
| Hemoglobin (<11.0 mg/dl) | 1.270 (0.768, 1.783) | <0.01 ¥ | 1.213 (0.626, 1.815) | <0.01 * | 2 |
| Gravidity (prim-gravida) | 0.586 (0.091, 1.080) | 0.02 ¥ | 0.606 (0.001, 1.215) | 0.049 * | 1 |
| Previous ANC (no) | −0.419 (−1.101, 0.288) | 0.235 ¥ | 0.011 (−0.885, 0.949) | 0.98 | - |
| Birth interval (<24month) | −0.014 (−0.691, 0.647) | 0.97 | NA | - | |
| Pregnancy (Unplanned) | 0.079 (−0.491, 0.622) | 0.78 | NA | - | |
| Family planning use (yes) | −0.127 (−0.661, 0.387) | 0.63 | NA | - | |
| Comorbidity § (yes) | 1.627 (0.608, 2.686) | <0.01 ¥ | 1.475 (0.260, 2.744) | 0.02* | 2.5 |
| Alcohol consumption | 0.169 (−0.543, 0.826) | 0.63 | NA | - | |
* Variables retained in the reduced model using likelihood ratio test are; age, BMI, hemoglobin, height, gravidity, and comorbidity. Both backward and forward selection showed same results. β after internal validation with bootstrapping are shown. ¥ Variables included in the multivariable analysis (P < 0.25 in univariable analysis). § Comorbidity include pulmonary: history of asthma or COPD (chronic obstructive pulmonary disease); cardiac: history of heart failure or ischemic heart disease; renal diseases. NA—not included in the multivariable analysis (P > 0.25 in the univariate analysis). Simplified risk score: we divided the coefficient of predictors included in the reduced model by the smallest (0.606). BMI: Body Mass Index; ANC: Antenatal care.