I'm trying to imagine how their reference point - "standard yard" - looks like. Do they mean a field of just trimmed grass and nothing else? My daughter's dayc

I'm trying to imagine how their reference point - "standard yard" - looks like. Do they mean a field of just trimmed grass and nothing else? My daughter's daycare has trees, shrubs, flowers etc. with birds, insects and whatnot. People still get allergies (even to nuts, which was unheard of 30 years ago). I mean, this study is useful and I can't imagine letting kids out to play in a boring landscape, but I wouldn't hold out hope for this being a significant factor in the development of allergies.