Overview of the sample size calculations for Hb; ferritin; adverse events; mental health; physical health
| Iron supplementation | Placebo | Required sample size | Sufficiency | |
| Hb | 134 (11) g/L | 120 (12) g/L | 19 | Sufficient |
| Ferritin | 28.0 (9.8) µg/L | 12.9 (8.3) µg/L | 14 | Sufficient |
| Adverse events* | 39.2% | 15.5% | 144 | Sufficient |
| Mental health† | 40.1 (4.8) | 40.7 (4.8) | 2016 | Not sufficient |
| Physical condition† | 54.8 (3.3) | 52.4 (5.2) | 60 | Sufficient |
*Adverse events included gastrointestinal symptoms, dizziness, headache, acne, palpitations and renal lithiasis.
†The outcome parameter mental health and physical condition were based on construct scores from the 12-Item Short Form Survey (SF-12) .
Hb, haemoglobin.