Birth characteristics by infertility type: OR
| Multinomial regression, controls | Multinomial regression, no controls | Binary logistic regression, controls | Binary logistic regression, no controls | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| p Value | OR | CI | p Value | OR | CI | p Value | OR | CI | P Value | OR | CI | |
| Variables by infertility type | ||||||||||||
| Preterm (<37 weeks) | ||||||||||||
| Female/combined (ref) Male | 0.291 | 1.685 | 0.639 to 4.441 | 0.341 | 1.588 | 0.613 to 4.109 | – | – | – | – | – | – |
| Female/combined (ref) Unexplained | 0.597 | 1.268 | 0.525 to 3.063 | 0.900 | 1.053 | 0.471 to 2.353 | – | – | – | – | – | – |
| Female/combined (ref) Male/unexplained | – | – | – | – | – | – | 0.332 | 1.446 | 0.686 to 3.048 | 0.530 | 1.253 | 0.620 to 2.535 |
| LBW (<2500 g) | ||||||||||||
| Female/combined (ref) Male | 0.095 | 2.200 | 0.780 to 2.310 | 0.071 | 2.314 | 0.930 to 5.760 | – | – | – | – | – | – |
| Female/combined (ref) Unexplained | 0.057 | 2.637 | 0.973 to 7.150 | 0.069 | 2.216 | 0.939 to 5.234 | – | – | – | – | – | – |
| Female/combined (ref) Male/Unexplained | – | – | – | – | – | – | 0.022* | 2.397 | 1.134 to 5.065 | 0.021* | 2.262 | 1.132 to 4.756 |
| LGA | ||||||||||||
| Female/combined (ref) Male | 0.595 | 0.788 | 0.327 to 1.900 | 0.590 | 0.786 | 0.327 to 1.886 | – | – | – | – | – | – |
| Female/combined (ref) Unexplained | 0.712 | 0.841 | 0.335 to 2.108 | 0.679 | 0.831 | 0.346 to 1.994 | – | – | – | – | – | – |
| Female/combined (ref) Male/unexplained | – | – | – | – | – | – | 0.591 | 0.813 | 0.381 to 1.732 | 0.573 | 0.809 | 0.386 to 1.694 |
| SGA | ||||||||||||
| Female/combined (ref) Male | 0.341 | 1.469 | 0.666 to 3.240 | 0.339 | 1.443 | 0.681 to 3.057 | – | – | – | – | – | – |
| Female/combined (ref) Unexplained | 0.047* | 2.729 | 1.015 to 7.338 | 0.041* | 2.574 | 1.041 to 6.364 | – | – | – | – | – | – |
| Female/combined (ref) Male/unexplained | – | – | – | – | – | – | 0.064 | 1.912 | 0.962 to 3.800 | 0.057 | 1.867 | 0.981 to 3.552 |
*Significant at the p=0.05 level.
LBW, low birth weight; LGA, large for gestational age; SGA, small for gestational age.