Table 1 Summary characteristics of the included studies in the systematic review.
Characteristics | N = 101k | Percentage | Type of micronutrient | Percentage | |
|---|---|---|---|---|---|
WHO region | Minerals/electrolytes | ||||
Region of Americas (AMR) | 7 | 7% | Magnesium | 20 | 20% |
European Region (EUR) | 11 | 11% | Zinc | 8 | 8% |
Eastern Mediterranean Region (EMR) | 23 | 23% | Iron | 4 | 4% |
South-East Asian Region (SEAR) | 34 | 34% | Copper | 2 | 2% |
Western Pacific Region (WPR) | 14 | 14% | Chromium | 2 | 2% |
African Region (AFR) | 6 | 6% | Vitamins | ||
Missing data | 6 | 6% | Vit B12 | 7 | 7% |
Study design | Vit C | 1 | 1% | ||
Cross-sectional analytical | 91 | 90% | Vit D | 56 | 55% |
Cohort | 6 | 6% | Vit K2 | 1 | 1% |
Case-control | 2 | 2% | Language | ||
SRMA | 2 | 2% | English | 99 | 98% |
Study approach | Portuguese | 1 | 1% | ||
Hospital-based | 95 | 94% | Chinese | 1 | 1% |
Community-based | 3 | 3% | Year of publication | ||
Missing data | 3 | 3% | 1998–2015 | 24 | 24% |
2016–2023 | 77 | 76% |
