Table 5.
Effect of maternal serum ferritin (SF) depletion on adverse birth outcomes: logistic regression analysis
| Predictor | cOR | 95 % CI | P-value | aOR | 95 % CI | P-value | ||
|---|---|---|---|---|---|---|---|---|
| LBW | ||||||||
| Maternal age | 0·97 | 0·93 | 1·02 | 0·21 | 1·02 | 0·95 | 1·09 | 0·56 |
| Preterm birth | 22·70 | 13·54 | 38·06 | <0·001 | 33·10 | 15·06 | 72·65 | <0·001 |
| Living in the urban area | 0·65 | 0·40 | 1·06 | 0·08 | 0·32 | 0·14 | 0·74 | 0·008 |
| Female gender | 1·44 | 0·94 | 2·22 | 0·09 | 1·86 | 0·87 | 3·98 | 0·11 |
| Belonging to the lowest SES | 1·23 | 0·48 | 3·11 | 0·67 | 1·14 | 0·19 | 7·03 | 0·88 |
| Prenatal care visits | 0·87 | 0·80 | 0·94 | 0·001 | 0·86 | 0·75 | 0·99 | 0·04 |
| SF depletion | 0·33 | 0·16 | 0·66 | 0·002 | 0·37 | 0·15 | 0·91 | 0·03 |
| PB | ||||||||
| Prenatal care visits | 0·87 | 0·78 | 0·94 | 0·001 | 0·86 | 0·78 | 0·96 | 0·007 |
| Maternal age | 0·99 | 0·95 | 1·04 | 0·85 | 1·00 | 1·00 | 0·95 | 0·87 |
| Female gender | 1·14 | 0·73 | 1·78 | 0·57 | 1·33 | 1·33 | 0·75 | 0·32 |
| Belonging to the lowest SES | 1·42 | 0·51 | 3·98 | 0·51 | 1·62 | 1·62 | 0·37 | 0·52 |
| Living in the urban area | 1·41 | 0·77 | 2·59 | 0·27 | 1·15 | 1·15 | 0·54 | 0·72 |
| SF depletion | 0·45 | 0·24 | 0·87 | 0·02 | 0·39 | 0·20 | 0·75 | 0·005 |
| SGA* | ||||||||
| Maternal age | 0·92 | 0·89 | 0·96 | <0·0001 | 0·95 | 0·91 | 0·99 | 0·02 |
| Living in the urban area | 0·65 | 0·45 | 0·93 | 0·02 | 0·41 | 0·26 | 0·66 | <0·001 |
| Belonging to the lowest SES | 1·26 | 0·62 | 2·48 | 0·51 | 1·10 | 0·42 | 2·93 | 0·84 |
| SF depletion | 0·66 | 0·42 | 1·03 | 0·069 | 0·66 | 0·42 | 1·05 | 0·08 |
cOR, crude OR; aOR, adjusted OR; LBW, low birth weight; SES, socio-economic stratification; PB, preterm birth; SGA, small for gestational age.
*
All models included potential confounders as covariates (maternal age, SES and neonate sex), except for SGA because INTERGROWTH21 calculates sex-adjusted centiles.