Cumulative Outcomes per 100 Couples by Time Completed in Natural Procreative Technology Evaluation and Treatment
| Time Interval (months) | Cumulative Withdrawals from NPT (n “proportion”) | Conceptions | Live Births* | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Starting at Time Interval (n) | Cumulative Conceptions (n) | Crude Proportion | Adjusted Proportion† | Starting at Time Interval (n) | Cumulative Live Births (n) | Crude Proportion | Adjusted Proportion† | ||
| 0–3 | 105 (9.8) | 1072 | 75 | 7.0 | 7.3 | 1072 | 55 | 5.1 | 5.4 |
| 4–6 | 233 (21.7) | 892 | 152 | 14.2 | 15.9 | 895 | 111 | 10.4 | 11.8 |
| 7–12 | 478 (44.6) | 687 | 278 | 25.9 | 35.5 | 694 | 205 | 19.1 | 27.1 |
| 13–18 | 624 (58.2) | 316 | 326 | 30.4 | 48.5 | 337 | 255 | 23.8 | 41.8 |
| 19–24 | 672 (62.7) | 122 | 354 | 33.0 | 64.8 | 132 | 273 | 25.5 | 52.8 |
| 25–36‡ | 46 | 364 | 56 | 286 | |||||
* Live births are assigned the time interval when the conception occurred rather than when the birth occurred.
† Adjusted by life-table analysis, where withdrawal or continuing treatment at the end of study follow-up are censoring events.
‡ Proportions are not calculated beyond 24 months.