Table 1.

Selected characteristics of men in the NHANES III by tertile of serum total calcium concentration

Baseline total serum calcium tertile
Tertile 1Tertile 2Tertile 3
Number of participants5,0334,5104,669
Weighted population53,239,12450,734,31658,638,470
Prostate cancer deaths through 2006221017
Person–months of follow-up805,945730,711760,416
Mean total calcium (mmol/L)2.2 (0.09)2.3 (0.02)2.4 (0.07)
Mean ionized calcium (mmol/L)1.2 (0.04)1.2 (0.03)1.3 (0.04)
Mean Age (y)47.7 (16.96)43.0 (15.92)38.2 (15.40)
Mean BMI (kg/m2)26.7 (4.87)27.0 (5.23)26.2 (4.48)
Mean 25-OHD (ng/mL)30.0 (10.91)30.9 (11.46)32.2 (11.82)
Mean Albumin (g/dL)4.2 (0.34)4.3 (0.31)4.4 (0.31)

NOTE: Where means are given, SD appear in parentheses. Means and SD account for sample weights and complex sampling design of NHANES III. The approximate normal range for total serum calcium is 2.17–2.52 mmol/L (8.7–10.1 mg/dL) and for ionized serum calcium is 1.12–1.32 mmol/L (4.6–5.3 mg/dL).