Variable HYPOCALCEMIA Normal CALCEMIA (control group) P value Birth weight <2500g (n=297) 2500-4000g (n=603) n (%) n (%) < 0,05 S 53.71% 41.94% 46.28% 58.05% AGE (Day) 0-3 day 4-7day 46.07% 16.33% 53.92% 83.33% < 0,05 S PREMATURITY 79.09% 20.90% < 0.001 S Mode of delivery Vaginal Caesarean 37.28% 55.94% 62.72% 44.05% 0, 05 S

Table 1: Distribution of serum calcium in function of the characteristics of the newborn.