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Women With Asthma May Take Longer to Get Pregnant

They ultimately had same number of children as women without the respiratory condition

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Using the data, the researchers were able not only to compare the twins, but also use them as a model for the whole population.

Gade's group divided the women into those with and without asthma, as well as those whose asthma was being treated and those whose asthma wasn't being treated. In addition, the women were asked whether they had been trying to get pregnant for more than a year without success and how many children they had.

Nearly 1,000 of the women had asthma. More of these women had a harder time getting pregnant than women without asthma (27 percent versus 21.6 percent), the researchers found.

Delayed pregnancy was significantly longer among women whose asthma was not treated compared with women whose asthma was being treated (30.5 percent of the untreated asthma group versus 23.8 percent of those receiving treatment), the researchers said.

In addition, women over 30 with asthma were more likely to experience delays in getting pregnant (32.2 percent of women over 30 versus 24.9 percent of women under 30).

Overall, however, women with asthma ultimately had the same average number of children as women without asthma, as those with asthma tended to have children earlier in life than those without asthma, the researchers said.

"Our hope is that our findings can give female asthmatics in infertility treatment a possible explanation as to why they experience prolonged time to pregnancy and thus are in need of fertility treatment," Gade said. "It is well known that one of the greatest frustrations among [women with] unexplained infertility is lacking a reason behind their fertility problems."

Whether asthma may also have an effect on male infertility isn't known, Gade said. "Unfortunately, we do not have any data on that," she said. "We have so far only focused on female fertility."

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