Table 3 Association between demographic characteristics and the risk of gestational vitamin D deficiency based on multiple logistic regression analyses.

From: Influent factors of gestational vitamin D deficiency and its relation to an increased risk of preterm delivery in Chinese population

Parameter

Crude models

Adjusted models

RR (95% CI)

P values

RR (95% CI)

P values

Pre-pregnancy BMI [kg/m2]1

  <18.5

1.25 (1.06, 1.47)

0.007

1.26 (1.07, 1.48)

0.006

  18.5–22.9

1.00

 

1.00

 

  ≥23.0

0.84 (0.67, 1.05)

0.116

0.84 (0.67, 1.06)

0.135

Season of blood sample2

  Spring

1.00

 

1.00

 

  Summer

1.11 (0.93, 1.33)

0.260

1.12 (0.94, 1.34)

0.211

  Fall

1.06 (0.88, 1.27)

0.555

1.05 (0.87, 1.27)

0.601

  Winter

1.45 (1.21, 1.74)

<0.001

1.45 (1.21, 1.74)

<0.001

Periconceptional multivitamin use3

  No

1.00

 

1.00

 

  Less than one month

0.69 (0.51, 0.94)

0.019

0.68 (0.50, 0.93)

0.016

  More than one month

0.72 (0.58, 0.89)

0.002

0.72 (0.58, 0.90)

0.003

  1. 1Adjusted for maternal age, periconceptional multivitamin use, and season of sampling.
  2. 2Adjusted for maternal age, pre-pregnancy BMI, periconceptional multivitamin use.
  3. 3Adjusted for maternal age, pre-pregnancy BMI, and season of sampling.
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