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FORT, FOI of POSEIDON subgroups 1a, 1b, 2a, and 2b.
| Subgroup | 1a | 1b | 2a | 2b | P-value |
| N | 465 | 1,322 | 398 | 603 | |
| FORT | 0.66 (0.62, 0.70) | 0.79 (0.77, 0.82) | 0.56 (0.53, 0.60) | 0.77 (0.74, 0.80) | <0.001 |
| FOI | 0.58 (0.54, 0.62) | 0.74 (0.72, 0.76) | 0.49 (0.46, 0.52) | 0.72 (0.68, 0.75) | <0.001 |
FORT, follicular output rate; FOI, follicle-to-oocyte index. Arithmetic mean (95% CI) / N (%) calculated using EmpowerStats (www.empowerstats.com) and R. Kruskal-Wallis rank test for continuous variables.
