Characteristics | Responding, n (%) | Missing, n (%) | P-value |
---|---|---|---|
Maternal age (years) | |||
<24 | 97 (3) | 37 (5) | |
25-29 | 774 (24) | 208 (26) | |
30-34 | 1363 (42) | 311 (39) | |
35-39 | 789 (24) | 187 (24) | |
≥40 | 215 (7) | 50 (6) | 0.081 |
Parity | |||
Nulliparous | 1960 (61) | 499 (63) | |
Multiparous | 1278 (39) | 294 (37) | 0.215 |
Danish language skills | |||
Yes | 3068 (96) | 755 (96) | |
No | 132 (4) | 28 (4) | 0.483 |
Cohabitation | |||
Yes | 2949 (93) | 716 (92) | |
No | 236 (7) | 63 (8) | 0.521 |
Education | |||
Compulsory school | 194 (7) | 56 (8) | |
Skilled | 106 (4) | 23 (3) | |
Tertitary | 210 (7) | 48 (7) | |
Bachelor or equivalent | 897 (31) | 220 (34) | |
Master or equivalent | 1451 (51) | 308 (47) | 0.321 |
Occupation | |||
Working | 2066 (71) | 454 (68) | |
Unemployed | 166 (6) | 41 (6) | |
Student | 464 (16) | 129 (19) | |
Otherb | 206 (7) | 46 (7) | 0.204 |
BMI (kg/m 2 ) | |||
Underweight (<18.5) | 154 (5) | 35 (5) | |
Normal (18.5-24.9) | 2291 (77) | 518 (76) | |
Overweight (25–29.9) | 398 (14) | 93 (14) | |
Obese (>30) | 126 (4) | 36 (5) | 0.689 |
Mean (SD) | 23 (4) | ||
Chronic illness | |||
Yes | 272 (9) | 64 (9) | |
No | 2399 (82) | 594 (84) | |
Other illness c | 255 (9) | 51 (7) | 0.399 |
Miscarriage | |||
Yes | 654 (20) | 150 (19) | |
No | 2584 (80) | 643 (81) | 0.418 |
Time to pregnancy, months | |||
0-2 | 1708 (56) | 434 (61) | |
3-11 | 935 (30) | 195 (27) | |
≥12 | 428 (14) | 83 (12) | 0.031 |
Pregnancy planning | |||
Very planned | 1462 (47) | 288 (40) | |
Fairly planned | 885 (29) | 202 (28) | |
Neither planned nor unplanned | 486 (16) | 160 (22) | |
Fairly unplanned | 116 (4) | 38 (5) | |
Very unplanned | 134 (4) | 34 (5) | 0.000 |
Assisted reproductive technology (ART) | |||
Yes | 402 (13) | 74 (10) | |
No | 2672 (87) | 648 (90) | 0.039 |
Exercice | |||
Yes | 2019 (70) | 475 (71) | |
No | 859 (30) | 189 (28) | 0.514 |
Alcohol before pregnancy, no of units/week | |||
0 | 960 (30) | 17 (13) | |
1 | 580 (18) | 23 (18) | |
2-7 | 1507 (47) | 74 (58) | |
≥8 | 178 (5) | 14 (11) | 0.000 |
Smoking before pregnancy | |||
Yes | 309 (10) | 87 (11) | |
No | 2894 (90) | 692 (89) | 0.203 |