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Table 3 Vitamin D levels for surgical site infection, infectious complications, and PoC are shown

From: The association between preoperative 25-OH vitamin D levels and postoperative complications in patients undergoing colorectal cancer surgery

Variables

Study population (n = 104)

N (%)

25-OH vitamin D levels**

Mean values ± SD (median; min–max) ng/ml

U, p-value

Surgical site infection/yes

9 (8.7%)

16.4 ± 9.1 (14.3; 5–60.1)

U = 246.000, p = 0.036*

Surgical site infection/no

95 (91.3%)

11.4 ± 7.7 (8.3; 4.5–25.9)

Infectious complications/yes

18 (17.3%)

16.8 ± 9.4 (14.8; 5–60.1)

U = 515.000, p = 0.026*

Infectious complications/no

86 (82.7%)

12.1 ± 6.2 (11.1; 4.5–25.9)

Postoperative complications/yes

25 (24%)

16.8 ± 9.7 (14.6; 5–60.1)

U = 757.000, p = 0.08

Postoperative complications/no

79 (76%)

13.1 ± 6.2 (11.9; 4.5–25.9)

  1. * Variables with p value < 0.05
  2. **In this hypothesis testing table, the power analysis was 75.3%. To obtain a significant difference between categorical variables of vitamin D levels and infectious complications, the number needed to be treated was 6789. To that end, we chose to use scale variables for vitamin D levels to demonstrate the relation with infectious complications. Since it gives the reason of using vitamin D levels as scale variables while analysing its relation to infectious complications (which is the main outcome of the study), not as subgroups of vitamin D levels
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BMC Surgery

ISSN: 1471-2482

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