Table 2.
Positive β-hCG | Miscarriagea | Live birth | ||||||||
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Endometrial thickness |
N | Incidence N (%) |
Crude RR (95% CI) |
Adjustedb RR (95% CI) |
Incidence N (%) |
Crude RR (95% CI) |
Adjustedb RR (95% CI) |
Incidence N (%) |
Crude RR (95% CI) |
Adjustedb RR (95% CI) |
≤7 mm | 315 | 103 (32.7) | 0.80 (0.68–0.94) | 0.74 (0.59–0.94) | 38 (12.1) | 0.98 (0.72–1.34) | 0.96 (0.64–1.45) | 62 (19.7) | 0.73 (0.58–0.92) | 0.64 (0.45–0.90) |
>7 to <11 mm | 2853 | 1169 (40.8) | REF | REF | 351 (12.3) | REF | REF | 772 (27.1) | REF | REF |
≥11 mm | 3012 | 1340 (44.5) | 1.09 (1.02–1.15) | 1.12 (1.04–1.21) | 329 (10.9) | 0.89 (0.77–1.02) | 0.97 (0.81–1.15) | 970 (32.2) | 1.19 (1.10–1.29) | 1.23 (1.11–1.37) |
RR: risk ratio; CI: confidence interval.
Excludes ectopic pregnancy and therapeutic abortion.
Adjusted for age, body mass index, peak progesterone, peak oestradiol, and number of oocytes retrieved.