Table 3.
The effect of YYB on children’s hemoglobin concentration and continuous, anthropometric outcomes in China.
| Post-Only Studies with Concurrent-Control | Number of Studies | Total Intervention Participants | Total Control Participants | Mean Difference (95% CI) | p-Value for Summary Effects | I2 for Heterogeneity (%) |
| Hemoglobin concentration (g/L) | 7 | 2810 | 1714 | 4.43 (1.55, 7.30) | 0.003 | 96 |
| Height (cm) | 6 | 2061 | 1689 | 2.46 (0.96, 3.97) | 0.001 | 94 |
| Weight (kg) | 6 | 2061 | 1689 | 0.79 (0.25, 1.32) | 0.004 | 97 |
| Height-for-age Z score (SD) | 3 | 1009 | 776 | −0.03 (−0.68, 0.62) | 0.94 | 95 |
| Weight-for-height Z score (SD) | 3 | 1009 | 776 | 0.27 (0.09, 0.45) | 0.003 | 66 |
| Weight-for-age Z score (SD) | 3 | 1009 | 776 | 0.20 (−0.11, 0.51) | 0.21 | 88 |
| Pre-Post Studies | Number of Studies | Total Posttest Participants | Total Pretest Participants | Mean Difference (95% CI) | p-Value for Summary Effects | I2 for Heterogeneity (%) |
| Hemoglobin concentration (g/L) | 7 | 3370 | 3817 | 6.58 (2.71, 10.45) | <0.001 | 99 |
| Height (cm) | 5 | 2088 | 2213 | 2.46 (1.35, 3.58) | <0.001 | 90 |
| Weight (kg) | 5 | 1800 | 2212 | 0.72 (0.33, 1.10) | <0.001 | 94 |
| Height-for-age Z score (SD) | 5 | 1691 | 1821 | 0.24 (0.10, 0.39) | <0.001 | 70 |
| Weight-for-height Z score (SD) | 4 | 1438 | 1564 | 0.28 (−0.05, 0.61) | 0.10 | 95 |
| Weight-for-age Z score (SD) | 5 | 1691 | 1821 | 0.25 (−0.05, 0.56) | 0.11 | 95 |