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Table 3 Independent predictors of 25(OH)D 3 concentrations in the combined population and in women and men separately a)

From: Sex-specific determinants of serum 25-hydroxyvitamin D3 concentrations in an elderly German cohort: a cross-sectional study

 

Combined sexes (n = 162) b)

Women (n = 113) c)

Men (n = 49) c),d)

25(OH)D 3 [nmol/L]

25(OH)D 3 [nmol/L]

25(OH)D 3 [nmol/L]

B

β

P

B

β

P

B

β

P

Intercept

50.547

 

< 0.0001

84.061

 

< 0.0001

9.646

 

0.654

Intact parathyroid hormone [pmol/L]

-1.324

-0.286

< 0.0001

-1.558

-0.323

0.0001

-1.041

-0.254

0.043

Total body fat (%)

-0.398

-0.224

0.002

-0.549

-0.208

0.013

   

Smoking (no/yes)

-4.291

-0.151

0.030

   

-7.501

-0.282

0.026

Time spent outdoors (min/d)

0.027

0.242

0.001

0.041

0.328

0.0002

   

Month of blood sampling (July/August vs. September)

5.946

0.208

0.003

6.731

0.229

0.007

   

Physical activity level

17.489

0.189

0.008

   

35.623

0.336

0.011

Vitamin D supplements (no/yes)

6.782

0.151

0.028

7.454

0.172

0.040

   

Household income ≥ 1500 €/month (no/yes)

      

9.362

0.302

0.020

Adjusted R 2 for the final model

 

0.280

  

0.296

  

0.316

 
  1. Abbreviations: 25(OH)D3, 25-hydroxyvitamin D3; adjusted R 2, proportion of the total variance explained by the final model.
  2. a)Multiple linear regression analyses were performed using stepwise backward procedure and the 25(OH)D3 concentration as the dependent variable. The results of the analyses are expressed in terms of the non-standardised coefficient beta (B), standardised coefficient beta (β) and the adjusted coefficient of determination (R 2) for the final model. Only variables, which remained in the final model, are presented.
  3. b)Serum 25(OH)D3 concentration as dependent variable and age, sex, total body fat, estimated glomerular filtration rate, intact parathyroid hormone, month of blood sampling, time spent outdoors, intake of dietary vitamin D, vitamin D supplements, dietary calcium, calcium supplements, phosphorus and alcohol, physical activity level, smoking and household net income as possible independent variables.
  4. c)Serum 25(OH)D3 concentration as dependent variable and total body fat, intact parathyroid hormone, month of blood sampling, time spent outdoors, intake of vitamin D supplements, physical activity level, smoking and household net income as possible independent variables.
  5. d)When only intact parathyroid hormone, physical activity level, smoking and household net income were included in the male regression model, the results remained unchanged.