N | Mean age (SD) | Mean education (SD) | Living with partner, n (%) | Monthly income >€2000, n (%) | Blue-collar occupation, n (%) | Mean BMI (SD) | Smokers†, n (%) | |
---|---|---|---|---|---|---|---|---|
Eligible | ||||||||
Included | 7472 | 29.1 (5.4) | 10.5 (4.2) | 7040 (94.5) | 1062 (15.7) | 682 (9.1) | 23.9 (4.3) | 1952 (26.4) |
Excluded | 862 | 30.0 (5.3) | 10.6 (4.2) | 787 (94.1) | 63 (13.2) | 62 (7.9) | 23.8 (4.3) | 156 (20.3) |
p Values‡ | p<0.001 | p=0.670 | p=0.691 | p=0.146 | p=0.253 | p=0.636 | p<0.001 | |
Male infertility | 105 | 30.9 (4.3) | 11.3 (4.0) | 99.0 | 20.2 | 6.7 | 23.9 (4.3) | 20.0 |
Non-spontaneous conception | 119 | 31.5 (4.1) | 12.2 (4.3) | 99.2 | 27.4 | 3.4 | 23.6 (3.8) | 13.0 |
Recruited during pregnancy | 280 | 29.5 (5.8) | 9.2 (3.6) | 89.9 | 4.9 | 13.1 | 24.7 (4.8) | 30.0 |
Missing data* | 358 | 29.7 (5.4) | 10.9 (4.4) | 94.4 | 10.3 | 5.2 | 23.3 (4.1) | 15.2 |
Non-eligible | ||||||||
Age <18 | 161 | 16.4 (0.9) | 7.1 (2.1) | 51.6 | 2.6 | 5.3 | 21.8 (3.0) | 40.4 |
*Missing data on: fertility status, education, income, occupation, number of previous pregnancies.
†Smokers—smoking 1 or more cigarettes per day 3 months before conception.
‡p Values for the comparison between included and excluded participants.
BMI, body mass index.