Table 4.

Least square mean of baseline serum 25(OH)D and 1,25(OH)2D by calcium intake among 275 men in a PLCO substudy

N25(OH)D (nmol/L)
1,25(OH)2D (pmol/L)
Least squares mean (95% CI)*PLeast squares mean (95% CI)*P
Dietary calcium (mg/d)
    <7508253.28 (39.43-67.13)0.8778.72 (65.04-92.41)0.34
    571-1,0007649.91 (36.70-63.12)84.12 (71.07-97.18)
    1,001-1,5006751.56 (37.97-65.14)76.26 (62.81-89.71)
    ≥1,5004753.29 (38.79-67.79)80.24 (65.89-94.59)
Supplementary calcium (mg/d)
    014749.33 (33.91-64.75)0.5578.04 (62.78-93.30)0.67
    1-3998351.47 (38.49-64.45)82.49 (69.63-95.33)
    ≥4004255.25 (41.40-69.11)78.03 (64.31-91.75)
  • * Least squares means of serum 25(OH)D and 1,25(OH)2D were adjusted for vitamin D, supplemental vitamin D, race, season of blood draw, body mass index, physical activity, study center, and age.