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Sample size required to measure change in mean percentage meeting intake over time for 4 different nutrients at 4 different SD assumptions
| Assumed mean percentage meeting intake of nutrient at day | Sample size for time effect at SD | |||||||
|---|---|---|---|---|---|---|---|---|
| Nutrient | 7 d | 14 d | 21 d | 28 d | SD = 3% | SD = 5% | SD = 7% | SD = 10% |
| Magnesium | 6% | 4% | 13% | 15% | 6 | 8 | 11 | 17 |
| Sodium | 15% | 23% | 29% | 33% | 5 | 6 | 8 | 11 |
| Potassium | 7% | 9% | 13% | 15% | 7 | 11 | 18 | 31 |
| Zinc | 8% | 8% | 8% | 23% | 5 | 7 | 8 | 11 |
