Table 3

Analysis of the relationships between zinc concentration in preterm newborns and the dichotomous variables of small for gestational age, recombinant human erythropoietin treatment, bronchopulmonary dysplasia, congenital or nosocomial infection, preterm bone disease, gender and birth before 32 weeks of gestation

(IQ25–IQ75) of serum zinc concentration (μmol/L)
P value*
Small for gestational age
 Yes (n=18)3.3 (1.7–4.3) 0.011
 No (n=65)4.9 (3.0–7.6)
Treatment with recombinant human erythropoietin
 Yes (n=30)3.8 (2.1–4.9) 0.020
 No (n=53)5 (3.0–7.7)
Bronchopulmonary dysplasia
 Yes (n=16)2.7 (1.8–4.3) 0.005
 No (n=67)4.9 (3.0–7.7)
Congenital or nosocomial infection
 Yes (n=22)4.3 (2.1–6.4)0.37
 No (n=61)4.4 (2.8–7.0)
Metabolic bone disease
 Yes (n=6)3.9 (2.4–5.1)0.36
 No (n=77)4.4 (2.7–7.0)
 Male (n=39)4.4 (2.8–7.6)0.33
 Female (n=44)4.2 (2.2–6.4)
Birth before 32 weeks of gestation
 Yes (n=43)4.2 (2.2–5.6)0.13
 No (n=40)4.9 (3.0–7.7)
  • *Mann-Whitney U test.