Practically zero chance of that since organic foods are significantly more expensive and used by only a small percentage of any population. They'd have to seek out women who used organic produce to have such a study group. And Bt is probably not used on fruit and most vegetables other than the cabbage family. It's used mostly against leaf chewing insects that attack the cabbage family of vegetables.
You ever been to Montreal or been a pregnant woman? I’ve done both. I can tell you right now that pregnant women are the population most likely to choose perceived quality and safety over cost considerations (and their perceptions will not necessarily be rational).
I can also tell you that Montreal is a liberal greenie enclave full of birkenstock types that think like pregnant women.
This study was done on 30 pregnant women and 30 non pregnant women and there was a significant difference in detectable levels of the Bt toxin in the two groups 93% vs 69 percent.
The levels of GM food in the general food supply for both groups would be similar if not identical so it’s pretty obvious that the pregnant women were making some different food choices than the non pregnant women.
What might that be, corn chips and soda pop or organic leafy greens?