Country | Belgium | 77 (33) | 14 (7) | 17 (24) | 19 (12) | 19 (11) | 15 (8) | 9 (14) | 170 (15) |
| Finland | 71 (30) | 4 (2) | 6 (8) | 4 (3) | 5 (3) | 4 (2) | 9 (14) | 103 (9) |
| Italy | 36 (15) | 76 (33) | 28 (39) | 89 (57) | 71 (44) | 24 (13) | 7 (11) | 331 (30) |
| England | 52 (22) | 136 (59) | 20 (28) | 44 (28) | 67 (41) | 141 (77) | 40 (62) | 500 (45) |
Male age at target time | Mean (SD) | 29 (5) | 27 (5) | 31 (5) | 31 (6) | 32 (6) | 31 (6) | 32 (6) | 30 (5) |
Male age group at target time | <30 | 121 (51) | 152 (66) | 33 (46) | 68 (44) | 62 (38) | 69 (38) | 21 (32) | 526 (48) |
30+ | 114 (48) | 78 (34) | 38 (54) | 88 (56) | 100 (62) | 114 (62) | 44 (68) | 576 (52) |
Female age at target time | Mean (SD) | 27 (4) | 25 (4) | 28 (4) | 28 (5) | 28 (5) | 28 (5) | 28 (5) | 27 (5) |
Female age group at target time | <30 | 167 (71) | 189 (82) | 48 (68) | 102 (65) | 105 (65) | 111 (60) | 40 (62) | 762 (69) |
30+ | 28 (29) | 39 (17) | 22 (31) | 54 (35) | 57 (35) | 70 (38) | 22 (34) | 332 (30) |
First pregnancy | Yes | 81 (34) | 72 (31) | 23 (32) | 57 (37) | 33 (20) | 22 (12) | 19 (29) | 307 (28) |
No | 155 (66) | 158 (69) | 48 (68) | 99 (63) | 129 (80) | 159 (86) | 46 (71) | 794 (72) |
Male smoking | Yes | 106 (45) | 120 (52) | 19 (27) | 68 (44) | 89 (55) | 100 (54) | 23 (35) | 525 (48) |
No | 129 (55) | 109 (47) | 51 (72) | 88 (56) | 73 (45) | 83 (45) | 42 (65) | 575 (52) |
Female smoking | Yes | 60 (25) | 76 (33) | 15 (21) | 35 (22) | 44 (27) | 49 (27) | 24 (37) | 303 (27) |
No | 161 (68) | 151 (66) | 55 (77) | 120 (77) | 117 (72) | 133 (72) | 41 (63) | 778 (70) |
Use of oral contraceptive | Yes | 100 (42) | 107 (47) | 34 (48) | 57 (37) | 62 (38) | 92 (50) | 28 (43) | 480 (43) |
No | 119 (50) | 123 (53) | 37 (52) | 98 (63) | 99 (61) | 91 (49) | 37 (57) | 604 (55) |
Genitourinary disorders | Yes | 2 (1) | 4 (2) | 1 (1) | 3 (2) | 4 (2) | 0 (0) | 2 (3) | 16 (1) |
Infertility treatment | Yes | 13 (6) | 2 (1) | 3 (4) | 3 (2) | 7 (4) | 6 (3) | 1 (2) | 35 (3) |
Year of occurrence of target date | 76–80 | 36 (15) | 48 (21) | 2 (3) | 25 (16) | 29 (18) | 44 (24) | 33 (51) | 217 (20) |
81–85 | 42 (18) | 56 (24) | 5 (7) | 29 (19) | 33 (20) | 48 (26) | 6 (9) | 219 (20) |
86–90 | 55 (23) | 77 (33) | 18 (25) | 38 (24) | 38 (23) | 43 (23) | 12 (18) | 281 (25) |
91+ | 103 (44) | 49 (21) | 46 (65) | 64 (41) | 62 (38) | 49 (27) | 14 (22) | 387 (35) |