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Table 3 Multivariate regression model: variables associated with baseline 25-hydroxyvitamin D (25-OHD) levels (n= 150) following backward stepwise method

From: An initial loading-dose vitamin D versus placebo after hip fracture surgery: baseline characteristics of a randomized controlled trial (REVITAHIP)

Variable name

B

Std. error

t

p

95% confidence interval

(Constant)

38.553

7.313

5.272

0.000

24.100– 53.006

Using vitamin D (no/yes)

25.633

6.139

4.176

0.000

13.502 – 37.765

Total Barthel -premorbid function(0-100)

0.203

0.079

2.579

0.011

0.048 – 0.359

VRS Pain rating after surgery (0-10)

-1.707

0.739

-2.310

0.022

-3.166 – -0.247

  1. r2 = 0.157; model significant at p<0.001.
  2. Variables excluded on 5 previous steps: Using calcium (no/yes), post-operative weight bearing (weight-bearing(WB)/Non-WB+Partial-WB), season of Vit D measurement (winter/other season), pre-admission residence (alone/with others), total number of medications (0-10).