This study examined the treatment of girls versus boys in Catholic elementary schools, building on the national studies of Dr. Myra Sadker and Dr. David Sadker, which have demonstrated bias against girls in American classrooms and curriculum. Subjects were 879 male and 868 female students from 81 classrooms (grades K-8) in 41 Catholic elementary schools of the Archdiocese of Louisville (Kentucky). Classroom observations lasted 40 minutes each and included coding of the Sadkers' INTERSECT research instrument. Teachers' comments were grouped into four categories: praise, acceptance, remediation, and criticism, and the percentages of each type were compared to those of the Sadkers' previous studies. This study found parallel numbers, but also demonstrated a higher number of praise responses in primary versus junior high classrooms. It also found that male students receive more attention in all categories, with the greatest difference in remediation. (Contains anecdotal evidence of gender bias and general suggestions to combat it.) (EV)