highly significantp < 0.001
Birth weight showed a highly significant ( p < 0.001) effect on D0–3, D4–60, and D0–90, and a significant ( p = 0.008) effect on D61–90, with estimates ranging from −0.33 to −0.44 and ORs ranging from 0.65 to 0.72, suggesting that increased birth weight is linked to reduced mortality risk.