Table 2.
Correlation analysis of different variables with zinc concentration
| Spearman rank correlation | P value * | |
| Anthropometric variables | ||
| Weeks of gestation (SEM) | 0.15 | – |
| Birth weight (kg) | 0.26 | 0.01 |
| Birth weight z-score | 0.24 | 0.02 |
| Birth length (cm) | 0.17 | – |
| Birth length z-score | 0.15 | – |
| Head circumference at birth (cm) | 0.15 | – |
| Head circumference at birth z-score | 0.10 | – |
| Nutritional development variables | ||
| Weight gain (g/day) | −0.20 | 0.050 |
| Weight at discharge (kg) | 0.07 | – |
| Weight at discharge z-score | 0.14 | – |
| Length at discharge (cm) | 0.15 | – |
| Length at discharge z-score | 0.22 | 0.040 |
| Increase in length (cm/week) | 0.05 | – |
| Head circumference at discharge (cm) | −0.06 | – |
| Head circumference at discharge z-score | 0.5 | – |
| Increase in head circumference (cm/week) | −0.06 | – |
| Nutritional Variables | ||
| Parenteral nutrition (days) | −0.19 | – |
| Iron intake (mg/kg/day) | −0.12 | – |
| Protein intake (g/kg/day) | −0.26 | 0.01 |
| Zinc intake (mg/kg/day) | −0.07 | – |
*Spearman correlation test.