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Summary statistics for the AFR analysis
| Income Group | Sample Size (N) | Mean AFR (years) | SE (years) | Modal AFR (years) |
|---|---|---|---|---|
| High-income | 2,726,845 | 29.4 | 5.6 | 30 |
| Middle-income | 946,557 | 24.8 | 5.5 | 20 |
| Low-income | 147,700 | 19.3 | 3.5 | 19 |
| Natural fertility | 183 | 20.4 | 5.0 | 18 |
| US WIC nonparticipant | 802,084 | 28.5 | 5.4 | 29 |
| US WIC participant | 348,341 | 23.3 | 5.0 | 20 |
Income groups classified by country GNI per capita: low-income = ≤ US $1085; middle-income = US $1086–13,205; high-income = ≥ US $13,205
