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Table 2 Description of general characteristics of preterm newborns (PTNB) and full-term newborns (FTNB) included in this study

From: Vitamin D plasma concentrations in pregnant women and their preterm newborns

Variables PTNB Group
(n = 66)
FTNB Group
(n = 92)
p-value
Mother
 25(OH)D (n = 144) ng/mL 21.7 ± 10.8 26.2 ± 9.8 0.011a
  Deficiency n (%) 27 (43.5%) 23 (28.0%) 0.018b
  Insufficiency n (%) 25 (40.3%) 29 (35.4%)  
  Sufficiency n (%) 10 (16.1%) 30 (36.6%)  
 Parathyroid hormone (n = 121) pg/mL 50.1 ± 40.7 51.1 ± 37.6 0.890a
 Calcium (n = 145) mg/dL 7.8 ± 1.2 8.7 ± 1.0 <  0.001a
 Phosphorus (n = 144) mg/dL 3.4 ± 1.5 3.3 ± 0.9 0.718a
 Alkaline phosphatase (n = 145) U/L 178.0 ± 81.6 269.1 ± 77.4 <  0.001a
Umbilical cord
 25(OH)D (n = 140) ng/mL 25.9 ± 13.9 31.9 ± 12.3 0.009a
  Deficiency n (%) 25 (41.7%) 17 (21.3%) 0.033b
  Insufficiency n (%) 13 (21.7%) 24 (30.0%)  
  Sufficiency n (%) 22 (36.7%) 39 (48.4%)  
 Calcium (n = 139) mg/dL 9.3 ± 1.1 10.2 ± 1.0 < 0.001a
 Phosphorus (n = 138) mg/dL 5.9 ± 2.1 5.0 ± 1.2 0.002a
 Alkaline phosphatase (n = 140) U/L 363.3 ± 185.1 324.1 ± 344.4 0.431a
  1. aLevel of significance of the Student’s t-test. bLevel of significance of Chi-square test