Controls | Unilateral (n = 165) | Bilateral (n = 87) | |||||
---|---|---|---|---|---|---|---|
(N = 136) | Crudea | Adjusted | Crudea | Adjusted | |||
N (%) | N (%) | OR | OR (95 % CI) | N (%) | OR | OR (95 % CI) | |
Birth control used in the year before the index pregnancyb | |||||||
Any birth control | 75 (52.5) | 85 (46.6) | 0.8 | 0.9 (0.5, 1.5) | 45 (47.9) | 0.8 | 0.7 (0.4, 1.4) |
Oral contraceptive pills | 43 (29.3) | 60 (32.4) | 1.2 | 1.5 (0.8, 2.5) | 28 (29.5) | 0.8 | 0.8 (0.4, 1.6) |
Injection, Implant, skin patch, Vaginal ring | 9 (6.1) | 13 (7.0) | 1.2 | 1.1 (0.4, 3.3) | 7 (7.4) | 1.0 | 0.9 (0.3, 3.5) |
Any hormonal contraceptive | 49 (33.3) | 71 (38.4) | 1.3 | 1.5 (0.9, 2.6) | 34 (35.8) | 0.9 | 0.9 (0.5, 1.7) |
Condoms | 26 (17.7) | 15 (8.1) | 0.4 | 0.4 (0.2, 0.9) | 14 (14.7) | 0.9 | 0.8 (0.4, 1.9) |
Intra uterine device (IUD) | 4 (2.7) | 3 (1.6) | 0.6 | 0.4 (0.1, 2.1) | 1 (1.1) | 0.4 | 0.4 (0.0, 4.8) |
Other type of birth control | 2 (1.4) | 2 (1.1) | 0.9 | 1.2 (0.2, 9.0) | 0 (0.0) | - | - |
Child conceived with the help of fertility treatmentc | |||||||
Any type of fertility treatment used by either parent | 9 (6.3) | 14 (7.7) | 1.1 | 1.4 (0.5, 3.5) | 8 (8.5) | 1.2 | 1.5 (0.5, 4.5) |
Mother took fertility medication for this pregnancy | 8 (5.6) | 14 (7.6) | 1.3 | 1.6 (0.6, 4.1) | 6 (6.4) | 1.0 | 1.2 (0.3, 4.1) |
Used IVF for this pregnancy | 0 (0) | 7 (3.8) | - | - | 5 (5.3) | - | - |
Used artificial intrauterine insemination | 2 (1.4) | 3 (1.6) | 1.1 | 1.3 (0.2, 8.3) | 3 (3.2) | 2.0 | 2.3 (0.3, 18.0) |
Used Intra Cytoplasmic Sperm Injection (ICSI) | 1 (0.7) | 3 (1.6) | 1.9 | 2.0 (0.2, 23.3) | 2 (2.1) | 1.9 | 2.4 (0.2, 28.9) |
Problem with egg was the reason for infertility treatment | 2 (1.4) | 2 (1.1) | 0.9 | 1.1 (0.1, 10.1) | 4 (4.3) | 2.9 | 4.0 (0.6, 29.0) |
Problem with sperm was the reason for infertility treatment | 0 (0.0) | 3 (1.6) | - | - | 2 (2.1) | - | - |
The reason for infertility treatment was unknown | 3 (2.1) | 7 (3.8) | 1.6 | 2.3 (0.6, 9.4) | 2 (2.1) | 0.8 | 1.3 (0.2, 9.1) |