Table 2.
Participation of children in the UBCS and SPATZ analyses.
| Category | UBCS (n) | SPATZ (n) | |
|---|---|---|---|
| Enrolled | 1090 | 1006 | |
| Singletons | 1042 | 934 | |
| Leptin measurement | 6 weeks | 6 weeks | 6 months |
| Human milk sample provided | 756 | 694 | 476 |
| Leptin measured | 747 | 668 | 445 |
| Remaining following leptin standardization * | 671 | 587 | 378 |
| Child BMI (exclusively breastfed **) | |||
| 3–4 weeks | 576 (572) | 554 (552) | 372 (332) |
| 3–4 months | 590 (573) | 555 (549) | 375 (336) |
| 6–7 months | 589 (565) | 531 (523) | 359 (336) |
| 1 year | 555 (527) | 519 (511) | 353 (328) |
| 2 years | 535 (503) | 485 (477) | 335 (312) |
* Standardization model required complete data on child’s age at sampling, maternal BMI, and estimated feedings per day; ** exclusive up to 3–4 week period for 6 week leptin and up to 3–4 month period for 6 month leptin.