Table 4.
The effect of YYB on prevalence of child anemia and the categorical outcomes of nutritional status in China.
| Post-Only Studies with Concurrent-Control | Number of Studies | Total Intervention Participants | Total Control Participants | Risk Ratio (95% CI) | p-Value for Summary Effects | I2 for Heterogeneity (%) | Risk Difference (95% CI) | p-Value for Summary Effects | I2 for Heterogeneity (%) |
| Anemia | 11 | 5869 | 3518 | 0.55 (0.45, 0.67) | <0.001 | 84 | −0.13 (−0.20, −0.07) | <0.001 | 95 |
| Stunting | 7 | 4368 | 2405 | 0.60 (0.44, 0.81) | <0.001 | 71 | −0.05 (−0.08, −0.03) | <0.001 | 52 |
| Underweight | 6 | 2218 | 1659 | 0.51 (0.39, 0.65) | <0.001 | 22 | −0.04 (−0.06, −0.03) | <0.001 | 0 |
| Wasting | 5 | 1831 | 1419 | 0.48 (0.32, 0.70) | <0.001 | 21 | −0.02 (−0.04, −0.01) | <0.001 | 50 |
| Pre-Post Studies | Number of Studies | Total Posttest Participants | Total Pretest Participants | Risk Ratio (95% CI) | p-Value for Summary Effects | I2 for Heterogeneity (%) | Risk Difference (95% CI) | p-Value for Summary Effects | I2 for Heterogeneity (%) |
| Anemia | 13 | 5300 | 6019 | 0.58 (0.50, 0.68) | <0.001 | 89 | −0.20 (−0.26, −0.13) | <0.001 | 93 |
| Stunting | 10 | 3873 | 4345 | 0.75 (0.60, 0.95) | 0.02 | 67 | −0.03 (−0.05, −0.01) | 0.01 | 68 |
| Underweight | 10 | 3873 | 4345 | 0.59 (0.42, 0.83) | 0.002 | 63 | −0.03 (−0.05, −0.01) | 0.003 | 72 |
| Wasting | 7 | 2793 | 3202 | 0.72 (0.45, 1.15) | 0.17 | 60 | −0.01 (−0.03, 0.00) | 0.14 | 64 |