Table 3.
Mineral intake (DRI) by gender and age (Mean, SD by USDA age groups)
| Nutrient | RDA | Gender | 13 yrs | 14–18 yrs | 19–21 yrs |
|---|---|---|---|---|---|
| Sodium (mg) | 13 (<2,200); 14–21 (<2,300) | M | 1649 ± 1191 | 2312 ± 1215 | 2419 ± 1777 |
| 13 (<2,200); 14–21 (<2,300) | F | 1384 ± 474 | 1404 ± 888 | 1606 ± 933 | |
| Potassium (mg) | 13 (4500); 14–21 (4700) | M | 2033 ± 889 | 2932 ± 1074 | 3158 ± 1042 |
| 13 (4500); 14–21 (4700) | F | 1939 ± 618 | 2495 ± 1491 | 2572 ± 1201 | |
| Phosphorus (mg) | 13–18 (1250); 19–21 (700) | M | 927 ± 437 | 1300 ± 539 | 1260 ± 697 |
| 13–18 (1250); 19–21 (700) | F | 807 ± 234 | 863 ± 367 | 1022 ± 538 | |
| Calcium | 13–18 (1,300); 19–21 (1,000) | M | 826 ± 283 | 1149 ± 449 | 1066 ± 394 |
| 13–18 (1,300); 19–21 (1,000) | F | 737 ± 255 | 853 ± 340 | 898 ± 568 | |
| Magnesium (mg) | 13 (240); 14–18 (410); 19–21 (400) | M | 206 ± 104 | 294 ± 119 | 295 ± 125 |
| 13 (240); 14–18 (360); 19–21 (310) | F | 196 ± 58 | 250 ± 146 | 255 ± 128 | |
| Iron (mg) | 13 (8); 14–18 (11); 19–21 (8) | M | 11± 8 | 21 ± 17 | 19 ± 12 |
| 13 (8); 14–18 (15); 19–21 (18) | F | 17 ± 22 | 14 ± 8 | 12 ± 7 | |
| Zinc (mg) | 13 (8); 14–21 (11) | M | 5.7 ± 3 | 10.4 ± 7 | 9.2 ± 7 |
| 13 (8); 14–18 (9); 19–21 (8) | F | 6.7 ± 5 | 7.3 ± 6 | 8.0 ± 5 | |
| Folate (mcg) | 13 (300); 14–21 (400) | M | 320 ± 229 | 450 ± 196 | 504 ± 203 |
| 13 (300); 14–21 (400) | F | 305 ± 162 | 372 ± 227 | 412 ± 253 | |
| Niacin (mg) | 13 (12); 14–21 (16) | M | 11 ± 8 | 17 ± 10 | 27 ±14 |
| 13 (12); 14–21 (14) | F | 12 ± 8 | 12 ± 8 | 21 ± 19 |
M = male; F = female. RDA = level of nutrient likely to meet the needs of 97.5% of the population (source: National Research Council, IOM).