Table 4.
Subgroup analysis of live birth.
| Subgroups | RR | 95% CI | |
|---|---|---|---|
| Frozen embryo transfer | HRT | 1.02 | 0.93,1.11 |
| NC | 0.95 | 0.87,1.03 | |
| Design | Prospective cohort | 1.06 | 0.88,1.28 |
| Retrospective cohort | 0.97 | 0.91,1.02 | |
| Change ratio | 0% | 0.98 | 0.92,1.05 |
| 5% | 1.00 | 0.91,1.10 | |
| 10% | 0.97 | 0.90,1.04 | |
| 15% | 0.95 | 0.79,1.16 | |
| 20% | 1.00 | 0.86,1.16 | |
| Measurement | TVUS | 0.91 | 0.72,1.14 |
| TVUS+AUS | 0.96 | 0.91,1.02 |
HRT, hormone replacement therapy; NC, natural cycles; TVUS, transvaginal ultrasonography; AUS, abdominal ultrasonography; RR, risk ratio; CI, confidence interval.