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Table 5 Mean serum vitamin D levels in relation to biochemical parameters and dietary intake

From: Determinants of serum levels of vitamin D: a study of life-style, menopausal status, dietary intake, serum calcium, and PTH

Factor No. Mean (95% CI) T–test (p–value*) ANOVA (p–value)
Albumin
 1 191 87.0 (82.5–91.6) Ref.
 2 164 91.2 (86.4–95.9) 0.344
 3 184 88.7 (84.1–93.3) 0.730
 4 180 91.7 (87.0–96.4) 0.058 0.076
Creatinine
 1 189 88.4 (84.0–92.9) Ref.
 2 168 88.2 (83.5–92.8) 0.337
 3 183 87.1 (82.2–91.9) 0.581
 4 179 94.5 (89.8–99.2) 0.001 0.003
Phosphate
 1 181 89.8 (84.3–95.3) Ref.
 2 182 83.5 (79.3–87.8) 0.177
 3 176 91.3 (86.7–95.8) 0.308
 4 180 93.5 (89.1–97.8) 0.012 <0.001
PTH
 1 181 95.3 (90.3–100.3) Ref.
 2 178 89.7 (85.5–93.8) 0.035
 3 179 89.0 (84.4–93.6) 0.029
 4 182 84.5 (79.7–89.3) <0.001 0.002
Calcium
 1 198 86.6 (82.1–91.1) Ref.
 2 154 85.7 (81.0–90.3) 0.425
 3 189 90.9 (86.1–95.8) 0.067
 4 178 93.8 (89.2–98.3) <0.001 0.001
Vitamin D–dietary
 1 145 81.1 (76.5 – 85.6) Ref.
 2 146 86.7 (82.3 – 91.1) 0.08
 3 145 88.3 (84.1 – 92.6) 0.02
 4 146 92.1 (87.4 – 96.7) 0.001
 5 145 93.1 (88.9 – 97.4) <0.001 0.001
Calcium–dietary
 1 145 87.3 (82.7 – 91.9) Ref.
 2 146 88.2 (83.8 – 92.6) 0.79
 3 145 90.1 (85.7 – 94.6) 0.39
 4 146 88.0 (83.4 – 92.7) 0.83
 5 145 87.6 (83.4 – 91.9) 0.92 0.92
Vitamin D–total**
 1 145 79.9 (75.3 – 84.6) Ref.
 2 146 86.0 (81.8 – 90.2) 0.06
 3 145 90.9 (86.2 – 95.7) 0.001
 4 146 93.5 (89.2 – 97.8) <0.001
 5 145 90.9 (86.7 – 95.0) 0.001 <0.001
Calcium–total**
 1 145 87.6 (82.8 – 92.3) Ref.
 2 146 87.4 (83.2 – 91.7) 0.97
 3 145 89.4 (84.8 – 94.0) 0.59
 4 146 88.2 (83.6 – 92.8) 0.85
 5 145 88.8 (84.7 – 92.9) 0.70 0.97
  1. * Compared to reference (p-value). ** Intake from diet and supplements.