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Basic characteristics of included RCTs_
| Inclusive RCTs | Population | Sample size | Ages (years) | Intervention measures | Intervention duration (years) | Dose (mg) | Percentage of lost visits (%) | Outcome indicators | ||
|---|---|---|---|---|---|---|---|---|---|---|
| Control group | Intervention group | I | C | |||||||
| Cheng 200512 | Healthy children | 41 | 39 | 10–12 | Calcium | Placebo | 2 | 1000 | 18.7 | Whole-body BMD |
| Anuradha 201214 | Healthy children | 70 | 69 | 8–12 | Calcium | Multivitamin tablets | 1 | 500 | 1.8 | Whole-body BMD |
| Lambert 200810 | Healthy children | 37 | 36 | 11–12 | Calcium fortified fruit drinks | Regular fruit drinks | 1 | 792 | 7.2 | Whole-body and 2nd–4th lumbar vertebrae BMD |
| Bonjour 200113 | Healthy children | 62 | 54 | 7–9.3 | Calcium | Placebo | 3–5 | 850 | 24.1 | 2nd–4th lumbar vertebrae BMD |