Table II.
Characteristics of the Three Calcium Intake Groups
| Calcium Intake Group (mg/day) | |||
|---|---|---|---|
| Low (<500) | Medium (500–1200) | High (>1200) | |
| No. (%) of subjects | 6078 (37%) | 7904 (47%) | 2707 (16%) |
| Age* (years) | 48.8±0.3 | 46.5±0.2 | 41.9±0.4 |
| Gender* (females) | 62% | 52% | 37% |
| Ethnicity* (% C, AA, H, O) | 34, 37, 24, 5 | 43, 25, 29, 3 | 47, 19, 30, 4 |
| Body mass index* (kg/m2) | 27.4±0.08 | 26.9±0.06 | 26.4±0.1 |
| Calcium intake* (mg/day) | 320±1 | 788±2 | 1711±11 |
| Energy consumption* (kcal/day) | 1482±8 | 2166±9 | 3145±26 |
| Calcium per energy* (mg/kcal) | 0.24±0.002 | 0.41±0.002 | 0.61±0.005 |
| C=Caucasian; AA=African American; H=Hispanic; O=other; *p<0.001 for comparison of three groups | |||