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Table 2 Change of z-scores in preterm infants from CA 40 weeks to 24 months

From: Postnatal growth of preterm infants during the first two years of life: catch-up growth accompanied by risk of overweight

Corrected age Z-score change of weight Z-score change of length/height
Difference (95% CI)a P-value Difference (95% CI)a P-value
Overall < 0.001 < 0.001
CA 40 weeks-3 months 0.08 (0.06–0.10) < 0.001 0.07 (0.04–0.09) < 0.001
CA 3–6 months − 0.07 (− 0.09- -0.05) < 0.001 0.01 (− 0.01–0.04) 0.310
CA 6–9 months − 0.10 (− 0.12- -0.08) < 0.001 − 0.07 (− 0.10- -0.05) < 0.001
CA 9–12 months − 0.08 (− 0.10- -0.06) < 0.001 − 0.09 (− 0.12- -0.07) < 0.001
CA 12–18 months − 0.17 (− 0.20- -0.15) < 0.001 − 0.11 (− 0.14- -0.08) < 0.001
CA 18–24 months − 0.02 (− 0.06–0.00) 0.071 0.00 (− 0.03–0.04) 0.918
  1. a Gestational age, gender, birth weight z-score, and intrauterine growth status were adjusted;
  2. CA corrected age; CI confidence interval