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Table 6 Crude and adjusted odds ratios (OR) for high (> 75 nmol/L) vs . low (≤75 nmol/L) vitamin D levels, and regression coefficients (βi) from multiple regression analysis, 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 Low (n) High (n) Crude OR (95% CI) Adjusted*OR (95% CI) βi (95% CI) Adjusted* βi \(95% CI)
Albumin
 1 68 123 1.00 1.00 Baseline Baseline
 2 50 114 1.26 (0.81–1.97) 1.15 (0.72– 1.83) 2.66 (–3.02 to 8.34) 1.55 (–3.92 to 7.02)
 3 55 129 1.30 (0.84–2.00) 1.22 (0.78– 1.92) 0.94 (–4.57 to 6.45) 0.18 (–5.13 to 5.48)
 4 56 124 1.22 (0.79–1.89) 1.27 (0.81– 2.00) 5.59 (0.05 to 11.13) 6.73 (1.39 to 12.1)
Creatinine
 1 66 123 1.00 1.00 Baseline Baseline
 2 55 113 1.10 (0.71– 1.71) 1.07 (0.68– 1.68) 2.40 (–3.23 to 8.02) 2.47 (–2.93 to 7.86)
 3 69 114 0.89 (0.58–1.35) 0.84 (0.54– 1.30) 1.61 (–3.89 to 7.11) 1.38 (–3.90 to 6.66)
 4 39 140 1.93 (1.21– 3.06) 1.70 (1.05– 2.76) 9.11 (3.58 to 14.6) 6.97 (1.57 to 12.4)
Phosphate
 1 62 119 1.00 1.00 Baseline Baseline
 2 69 113 0.85 (0.56–1.31) 0.75 (0.48– 1.18) −3.79 (–9.34 to 1.76) −4.71 (–10.0 to 0.58)
 3 54 122 1.18 (0.76–1.83) 1.12 (0.71– 1.78) 3.04 (–2.56 to 8.64) 2.81 (–2.54 to 8.16)
 4 44 136 1.61 (1.02–2.55) 1.54 (0.96– 2.48) 7.33 (1.77 to 12.9) 6.93 (1.63 to 12.2)
PTH
 1 51 130 1.00 1.00 Baseline Baseline
 2 45 133 1.16 (0.73–1.85) 1.26 (0.77– 2.05) −5.83 (–11.4 to –0.23) −4.76 (–10.1 to 0.62)
 3 56 123 0.86 (0.55–1.36) 0.83 (0.52– 1.32) −6.28 (–11.9 to –0.70) −6.71 (–12.1 to –1.34)
 4 77 105 0.54 (0.35–0.83) 0.59 (0.37– 0.93) −11.8 (–17.3 to –6.22) −9.96 (–15.3 to –4.61)
Calcium
 1 80 118 1.00 1.00 Baseline Baseline
 2 47 107 1.55 (0.99–2.41) 1.66 (1.04 –2.64) 2.19 (–3.50 to 7.88) 2.80 (–2.63 to 8.24)
 3 57 132 1.57 (1.03–2.39) 1.64 (1.05– 2.54) 5.10 (–0.29 to 10.5) 5.79 (0.63 to 11.0)
 4 45 133 2.00 (1.29–3.12) 2.18 (1.37– 3.47) 10.2 (4.78 to 15.7) 11.1 (5.79 to 16.3)
Vitamin D–dietary
 1 68 77 1.00 1.00 Baseline Baseline
 2 51 95 1.65 (1.03– 2.64) 1.70 (1.04– 2.78) 5.64 (–0.57 to 11.9) 5.35 (–0.64 to 11.3)
 3 36 109 2.67 (1.63– 4.40) 2.92 (1.74– 4.91) 7.29 (1.07 to 13.5) 7.50 (1.50 to 13.5)
 4 41 105 2.26 (1.39–3.68) 2.52 (1.51– 4.19) 11.0 (4.82 to 17.2) 11.5 (5.47 to 17.5)
 5 38 107 2.28 (1.52–.07) 2.68 (1.58– 4.57) 12.1 (5.86 to 18.3) 11.8 (5.58 to 17.9)
Calcium–dietary
 1 53 92 1.00 1.00 Baseline Baseline
 2 48 98 1.18 (0.73–1.91) 1.20 (0.73– 1.99) 0.87 (–5.41 to 7.16) 0.90 (–5.16 to 6.95)
 3 39 106 1.57 (0.95–2.58) 1.63 (0.97– 2.73) 2.79 (–3.51 to 9.08) 3.08 (–2.98 to 9.13)
 4 46 100 1.25 (0.77–2.04) 1.36 (0.82– 2.27) 0.71 (–5.58 to 7.00) 1.26 (–4.81 to 7.34)
 5 48 97 1.16 (0.72–1.89) 1.23 (0.74– 2.03) 0.30 (–6.00 to 6.60) 0.67 (–5.40 to 6.74)
Vitamin D–total**
 1 70 75 1.00 1.00 Baseline Baseline
 2 46 100 2.03 (1.26–3.27) 2.05 (1.25– 3.38) 6.08 (–0.12 to 12.3) 5.63 (–0.31 to 11.6)
 3 39 106 2.54 (1.55–4.14) 3.01 (1.79– 5.05) 11.0 (4.80 to 17.2) 12.1 (6.09 to 18.0)
 4 40 106 2.47 (1.52–4.03) 2.96 (1.76– 4.99) 13.5 (7.36 to 19.7) 14.8 (8.81 to 20.8)
 5 39 106 2.54 (1.55– 4.14) 2.84 (1.69– 4.78) 10.9 (4.72 to 17.1) 11.5 (5.50 to 17.5)
Calcium–total**
 1 55 90 1.00 1.00 Baseline Baseline
 2 46 100 1.33 (0.82–2.16) 1.36 (0.82– 2.26) −0.13 (–6.42 to 6.15) −0.15 (–6.19 to 5.90)
 3 41 104 1.55 (0.95–2.54) 1.63 (0.97– 2.71) 1.82 (–4.48 to 8.12) 2.46 (–3.61 to 8.53)
 4 49 97 1.21 (0.75–1.96) 1.34 (0.81– 2.22) 0.63 (–5.65 to 6.92) 1.68 (–4.39 to 7.75)
 5 43 102 1.45 (0.89–2.37) 1.52 (0.91– 2.52) 1.22 (–5.07 to 7.52) 1.43 (–4.63 to 7.50)
  1. * Adjusted for age, season and time in freezer for all factors in the table. ** Intake from diet and supplements.