Table 1.
Sample characteristics reported in the 14 included studies
| Country | Women who got pregnant (n) | Women who did not get pregnant (n) | Age of women (years; mean (SD)) | Duration of infertility (years; mean (SD)) | Previously used assisted reproductive technologies (yes/no (%)) | |
|---|---|---|---|---|---|---|
| Akyuz et al 200637* | Turkey | 39 | 41 | — | — | Yes (60%) |
| Anderheim et al 200547 | Sweden | 58 | 81 | 32.1 (3.6) | 4.5 (2.4) | Yes (7.24%) |
| Boivin and Takefman 19957 | Canada | 17 | 23 | 33.3 (3.6) | 4.4 (2.1) | No |
| de Klerk et al 200840 | Netherlands | 73 | 216 | 32.8 (3.1) | 3.6 (1.9) | Yes (6%)† |
| Demyttenaere et al 199236 | Belgium | 10 | 30 | 32.4 (4.1) | 5.6 (2.6) | Yes (57.50%) |
| Demyttenaere et al 199835 | Belgium | 23 | 75 | 29.7 (3.5) | 4.1 (3.1) | Yes (43.88%) |
| Ebbesen et al 200948 | Denmark | 215 | 566 | 31.2 (3.9) | 2.6 (1.9) | No |
| Klonoff-Cohen et al 200139 | USA | 46 | 90 | 36.8 (4.3) | 4.1 (3.0) | Yes (37%) |
| Lancastle and Boivin 200510 | UK | 13 | 63 | 33.3 (3.3) | 7.8 (3.0) | Yes (35.05%) |
| Lee et al 200641 | USA | 364 | 440 | — | 3.2 (2.4) | Yes (-) |
| Lintsen et al 200949 | Netherlands | 196 | 494 | 33.2 (3.5) | 3.4 (1.8) | No |
| Merari et al 200238 | Israel | 23 | 90 | 33.9 (5.3) | 7.2 (4.9) | Yes (-) |
| Sanders and Bruce 199934 | Australia | 15 | 75 | 32.6 (4.4) | — | Yes (23.30%) |
| Verhaak et al 200120 | Netherlands | 59 | 148 | 33.4 (3.7) | 3.7 (2.0) | Yes (12.5%) |
*51.2% were 31-35 years of age, and duration of infertility was 2-7 years for 61%.
†All participants with previous use of an assisted reproductive technology had had a live birth.