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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).