Table 3.
Paired t-test for micronutrient intakes estimated with and without supplement use (N = 363)
| Micronutrient | Mean | Standard Deviation | p-value (2-tailed) | |
|---|---|---|---|---|
| Pair 1 | Calcium, mg | 976.3 | 425.9 | .000 |
| Calcium, mg (without supplements) | 948.7 | 418.0 | ||
| Pair 2 | Magnesium, mg | 234.9 | 83.3 | .000 |
| Magnesium, mg (without supplements) | 228.1 | 81.1 | ||
| Pair 3 | Potassium, mg | 2282.5a | 834.5 | N/A |
| Potassium, mg (without supplements) | 2282.5a | 834.5 | ||
| Pair 4 | Zinc, mg | 12.3 | 5.7 | .000 |
| Zinc, mg (without supplements) | 9.6 | 3.5 | ||
| Pair 5 | Iron, mg | 15.4 | 7.7 | .000 |
| Iron, mg (without supplements) | 12.0 | 5.1 | ||
| Pair 6 | Vitamin C, mg | 107.9 | 64.6 | .000 |
| Vitamin C, mg (without supplements) | 94.2 | 58.6 | ||
| Pair 7 | Vitamin D, IU | 272.8 | 179.7 | .000 |
| Vitamin D, IU (without supplements) | 203.9 | 132.1 |
a
The correlation and t cannot be computed because the standard error of the difference is 0.