We did not, however, find any indication that fire damage directly impacted results of the larch trees, but there is a lot of indication that it impacted birch (Gradel et al. 2017).
Furthermore, using only the self-reported questionnaire may have impacted results (Graham and Ramirez, 2002).
These factors, especially parity and body mass index, would have likely impacted results in the multivariate models.
Concurrent activities to improve maternal and newborn health were likely taking place in the survey countries before and during the survey and these may have impacted results.
Stratified analyses examined whether respondent (woman or a proxy), age at conception (younger than age 20, age 20 or older), or plant (Indiana, Massachusetts, New York) impacted results.
Failure to capture all individuals with clinical or subclinical MHCs, or the potential for false positives from people who self-reported "yes" to an MHC but may not have been screened positive for symptoms, may have impacted results.
