Number and proportion (%) of mothers and fathers included in the analysis of periconceptual exposure
| Mothers | Fathers | |||||||
|---|---|---|---|---|---|---|---|---|
| Cases (n = 3838) | Controls (n = 7629) | Cases (n = 3838) | Controls (n = 7629) | |||||
| n | % | n | % | n | % | n | % | |
| *For each child enrolled in the study up to four parents (biological and non-biological) were interviewed. | ||||||||
| †Parents without a job history are included in the analysis as “not exposed”; non-natural parents are excluded. | ||||||||
| Parental interviews* | 3866 | 100 | 7657 | 100 | 3791 | 100 | 7308 | 100 |
| Non-natural parent | 48 | 1.2 | 57 | 0.7 | 195 | 5.1 | 298 | 4.1 |
| Included in analysis† | 3818 | 98.8 | 7600 | 99.3 | 3596 | 94.9 | 7010 | 95.9 |
| Reported job at periconception | 2091 | 54.1 | 4306 | 56.2 | 3088 | 81.5 | 5980 | 81.8 |