Table 1 General characteristics of the twins in the study.

From: The impact of vitamin D supplementation on VDR gene expression and body composition in monozygotic twins: randomized controlled trial

 

CG

SG

p value

(n = 45)

(n = 45)

Age, years

24.0 (21.0–27.0)

24.0 (21.0–27.0)

 

Education level n, (%)

Incomplete secondary education

1.0 (2.2)

1.0 (2.2)

 

Complete secondary education

8.0 (17.8)

10.0 (22.2)

 

Incomplete higher education

12.0 (26.7)

18.0 (40.0)

 

Complete higher education

14.0 (31.1)

12.0 (26.7)

 

Postgraduate

10.0 (22.2)

4.0 (8.9)

0.386

Family income level n, (%)

 < 1 Minimum wage

5.0 (11.1)

0.0 (0.0)

 

 > 3 < 5 Minimum wages

12.0 (26.7)

11.0 (24.4)

 

 > 5 < 7 Minimum wages

9.0 (20.0)

3.0 (6.7)

 

 > 7 < 10 Minimum wages

7.0 (15.6)

7.0 (15.6)

 

 > 10 < 20 Minimum wages

3.0 (6.7)

9.0 (20.0)

 

 > 20 Minimum wages

4.0 (8.9)

4.0 (8.9)

 

Does not know

3.0 (6.7)

7.0 (15.6)

 

Did not answer

2.0 (4.4)

4.0 (8.9)

0.065

Wears sunscreen n, (%)

10.0 (22.2)

11.0 (24.4)

 

Does not wear sunscreen n, (%)

35.0 (77.8)

34.0 (75.6)

0.758

  1. Categorical variables are shown as number (percentage) and compared by chi-square test. Continuous variables are shown as median (percentile 25–percentile 75) and compared by Wilcoxon test. CG, Control group; SG, Supplemented group; BMI, body mass index; BMC, bone mineral density. Brazilian minimum wage per month = US$ 265.73.