Pell-eligible students enrolled in courses using OER at the University of Georgia not only saw signifiant improvement in course final grades but also lower withdrawal rates.
Colvard, N., Watson, E., & Park, H. (2018). The impact of Open Educational Resources [OER] on various student success measures. International Journal of Teaching and Learning in Higher Ed. Vol 30, No 2. http://www.isetl.org/ijtlhe/pdf/IJTLHE3386.pdf