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| Intervention | Internal Rate of Return | |
| Low efficacy | High efficacy | |
| Supplementation | 68 (65–70) | 104 (102–107) |
| areas w/subcenters | 142 (139–145) | 195 (192–198) |
| areas w/o subcenters | 59 (56–61) | 93 (90–95) |
| Fortification | 6 (5–7) | 22 (21–22) |
| GM fortification | 22 (21–23) | 43 (42–44) |
Note: Parentheses denote 95 percent confidence intervals. Internal rates of return are not incremental.
