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Table 1 Baseline characteristics of subjectsa

From: Evaluation of the efficacy of two doses of vitamin D supplementation on glycemic, lipidemic and oxidative stress biomarkers during pregnancy: a randomized clinical trial

Characteristic Group 1 (1000 IU/d)
n1 = 37
Group 2 (2000 IU/d)
n2 = 36
p value 2
Age, year 27.94 ± 5.60 27.41 ± 5.15 0.80
Gestational age at enrollment, week 10.39 ± 1.69 10.08 ± 2.17 0.77
Gestational age at delivery (week) 38.79 ± 1.65 39.91 ± 5.78 0.57
Weight gain at end of pregnancy (kg) 10.82 ± 5.21 12.01 ± 5.94 0.38
Weekly sunlight exposure score at enrollment 2.63 ± 2.08 1.97 ± 1.67 0.14
Weekly sunlight exposure score at last visit 1.70 ± 1.65 1.21 ± 1.15 0.17
Sunscreen use, n (%) 11 (30.4) 13 (36.9) 0.49
Physical activity at enrollment, n (%)    0.37
 Low 29 (78.4) 28 (77.8)  
 Moderate 8 (21.6) 6 (16.7(  
 High 0 (0.0) 2 (5.6)  
Physical activity at last visit, n (%)    0.59
 Low 32 (86.5) 29 (80.6)  
 Moderate 5 (13.5) 6 (16.7)  
 High 0 (0.0) 1 (2.8)  
Duration of intervention, n (%)    0.87
 24 wk 11 (29.72) 10 (27.77)  
 25 wk 9 (24.32) 11 (30.55)  
 26 wk 6 (16.21) 7 (19.44)  
 27 wk 7 (18.91) 5 (13.88)  
 28 wk 4 (10.81) 3 (8.33)  
Season at first visit, n (%)    0.89
 Winter 14 (37.6) 16 (44.4)  
 Spring 23 (62.1) 20 (55.5)  
Routine supplementationa, n (%)
 Multivitamin 25 (67.5) 22 (61.1) 0.52
 Folic acid 29 (78.37) 25 (69.44) 0.37
 Iron 21 (56.75) 22 (61.11) 0.55
  1. adata are expressed as mean ± SD and the distribution between groups expressed as n (%)
  2. 2t test and χ2 test were used to compare baseline characteristics
  3. BMI Body mass index
  4. aThe participants started to intake routine supplementation late in the fourth month of pregnancy