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Table 2 Categories of 25(OH)D concentrations (nmol/L) and the median (md) values of grip strength (0–600 Newtons) with inter-quartile ranges (IQR) and the number (%) of women by country of birth who were unable to perform the upper leg muscle tests unaided

From: Physical performance and 25-hydroxyvitamin D: a cross-sectional study of pregnant Swedish and Somali immigrant women and new mothers

25(OH)D categories

< 10

10–24

25–49

50–74

≥ 75

 

 Swedish, n

 

8

31

28

4

 

 Somali, n

18

29

4

1

  
      

Rhoa p

Grip strength, md (IQR)

173 (143–219)

223 (189–258)

311 (267–354)

326 (294–370)

313 (303–415)

0.68 <.001

  Swedish

 

264* (202–327)

318* (293–344)

327 (305–349)

313 (303–415)

0.21 .078

  Somali

173 (143–219)

211 (187–244)

223 (106–285)

292

 

0.35 .012

Inability to: n (%)

     

pb

Squat

      

  Swedish

 

0

0

0

0

 

  Somali

15 (83.3)

18 (64.3)

4 (100)

1

 

.33

Sit to Stand

      

  Swedish

 

0

0

0

0

 

  Somali

1 (5.6)

1 (3.6)

0

0

  

Trendelenburg

      

  Swedish

0

1

0

0

0

.65

  Somali

5 (27.8)

5 (17.2)

1 (25.0)

0

 

.46

Stand on one leg

      

  Swedish

  

2 (6.5)

1 (3.6)

1 (25.0)

.57

  Somali

5 (27.8)

8 (27.6)

1 (25.5)

1 (100)

.72

  1. aSpearman rho with p-values below.
  2. *p < 0.05 Mann–Whitney U test compared with the group below.
  3. bTests of distribution across 25(OH)D categories by Kruskal-Wallis test.
  4. Significant p-values are in bold.