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Table 2 Associations of 25-hydroxyvitamin D (25(OH)D) with menstrual cycle characteristics among women from the Uterine Fibroid Study

From: Lower plasma 25-hydroxyvitamin D is associated with irregular menstrual cycles in a cross-sectional study

  N Model 1 a OR (CI) per 10 ng/mL decrease in 25(OH)D p-value N Model 2 b OR (CI), per 10 ng/ml decrease in 25(OH)D p-value
Short cycles (≤25 days) 135 1.10 (0.82, 1.49) 0.51 133 1.08 (0.79, 1.48) 0.64
Long cycles (≥32 days) 22 1.28 (0.69, 2.38) 0.43 22 1.31 (0.66, 2.60) 0.44
Irregular cycles 48 2.17 (1.23, 3.83) 0.008 46 1.87 (1.03, 3.39) 0.04
   Model 1 a OR(CI) for insufficient versus sufficient 25(OH)D    Model 2 b OR(CI) for insufficient versus sufficient 25(OH)D  
Short cycles (≤25 days) 135 1.01 (0.60, 1.72) 0.96 133 0.95 (0.55, 1.67) 0.87
Long cycles (≥32 days) 22 1.07 (0.40, 2.84) 0.89 22 1.02 (0.35, 2.96) 0.97
Irregular cycles 48 3.09 (1.02, 9.42) 0.05 46 2.44 (0.77, 7.69) 0.13
  1. aResults of the polytomous logistic regression model adjusted for age (linear) and race. The referent category is women who reported regular menstrual cycles and a usual cycle length between 26 and 31 days (N = 431).
  2. bResults of the polytomous logistic regression model adjusted for: age, race, BMI, education, age of menarche, current smoking, alcohol use, and physical activity. The referent category is women who reported regular menstrual cycles and a usual cycle length between 26 and 31 days (N = 426).