Table 2.Differences in Z-scores for weight, length, and head circumference between discharge and birth according to type of feeding at discharge.Study groupsWeightLengthHead circumference1−0.84 (0.68)−1.10 (1.18)−0.21 (1.23)2−1.02 (0.75)−1.54 (1.37)−0.52 (1.64)3−0.86 (0.71)−0.97 (1.21)−0.08 (1.24)Data are reported as ΔZ-Score [mean differences in Z-scores (SD)] for weight, length and skull perimeter between discharge and birth. Study groups: 1, exclusive breast milk; 2: mixed feeding; 3: exclusive artificial feeding.