Table 5.

Comparing the risk of asthma at 7 years among children conceived by assisted reproductive technologies with children of parents who tried to become pregnant for 12 months or were previously treated for unwanted childlessness in the MoBa

Exposure	N	N cases (%)	Unadjusted RR (95% CI)	Adjusted* RR (95% CI)
Previously treated for unwanted childlessness	4653	244 (5.2)	1	1
Conceived by assisted reproductive technologies	1391	85 (6.1)	1.17 (0. 92 to 1.48)	1.23 (0.95 to 1.58)
Time to conception >12 months	4964	262 (5.3)	1	1
Conceived by assisted reproductive technologies	1391	85 (6.1)	1.16 (0.91 to 1.47)	1.22 (0.95 to 1.57)

*Adjusted for maternal age, parity, education, smoking during pregnancy, prepregnancy BMI and maternal current asthma.

BMI, body mass index; MoBa, Norwegian Mother and Child Cohort Study; RR, relative risk.