Table 3.
Biochemical measures at baseline and at the end of each session on low and high Ca intake levels
| n | x̄ ± SD | Minimum | Median | Maximum | x̄ ± SD | Minimum | Median | Maximum | |
|---|---|---|---|---|---|---|---|---|---|
| Baseline measurements | |||||||||
| Testosterone (ng/ml) | 26 | 5.6 ± 2.7 | 0.8 | 5.1 | 11.3 | ||||
| Free testosterone (pg/ml) | 26 | 9.5 ± 4.8 | 1.5 | 9.3 | 17.6 | ||||
| Estrone (pg/ml) | 26 | 348.3 ± 262.7 | 106.4 | 250.2 | 1249.3 | ||||
| SHBG (pmol/ml)
|
27
|
132.0 ± 102.8
|
25.2
|
86.6
|
457.3
|
|
|
|
|
| Low Ca intake (670–1104 mg/d) | High Ca intake (1168–2003 mg/d) | ||||||||
| Serum PTH (pg/ml) | 26 | 29.0 ± 12.5 | 8.6 | 26.3 | 54.1 | 27.1 ± 7.0 | 14.6 | 25.9 | 44.2 |
| 1,25(OH)2D (pg/ml) | 26 | 38.5 ± 9.2a | 22.4 | 36.4 | 61.3 | 47.6 ± 15.0 | 24.0 | 47.5 | 86.9 |
| 25(OH)2D (ng/ml) | 26 | 28.4 ± 5.3 | 16.3 | 28.4 | 37.7 | 30.4 ± 6.1 | 19.4 | 29.9 | 40.8 |
| IGF-I (ng/ml) | 26 | 369.9 ± 113.2 | 183.4 | 386.3 | 637.8 | 338.9 ± 96.8 | 130.2 | 329.4 | 520.9 |
| IGFBP3 (ng/ml) | 26 | 2296.5 ± 901.9b | 1974.0 | 2774.5 | 5989.0 | 3610.2 ± 671.1 | 2498.0 | 3449.0 | 4931.0 |
| BAP (ng/ml) | 26 | 93.8 ± 36.1a | 29.6 | 82.5 | 165.8 | 87.1 ± 33.1 | 34.4 | 89.3 | 165.8 |
| OC (ng/ml) | 26 | 64.2 ± 31.9 | 19.1 | 62.5 | 131.4 | 68.8 ± 28.2 | 29.4 | 64.1 | 123.9 |
| Urinary free Dpd:Cr (nmol/mmol) | 26 | 32.7 ± 11.9 | 12.5 | 33.8 | 59.3 | 31.0 ± 10.5 | 12.9 | 31.9 | 52.6 |
| Urinary NTx:Cr (nmol BCE/mmol Cr) | 26 | 608.3 ± 273.9 | 180.3 | 590.8 | 1327.6 | 596.7 ± 265.7 | 169.6 | 520.2 | 1149.9 |
Assigned low Ca intake levels ranged from 800-1200 mg/d, and assigned high Ca intake levels ranged from 1300–2100 mg/d. Actual Ca intakes assessed from diet composites are in parentheses at the top of each corresponding section in the table. Paired t tests were used to compare differences between biochemistries at low and high Ca intakes. Therefore, only the subjects who were measured during both conditions were included in this analysis. BCE, Bone collagen equivalents; Cr, creatinine; Dpd, deoxypyridinoline.
a
P < 0.01 for paired t tests between low and high Ca intakes.
b
P < 0.05 for paired t tests between low and high Ca intakes.