Table 2 Summary of video data collected in years 1 and 3 from introductory chemistry, physics, and biology courses.

A detailed summary by course is provided in table S3.

DisciplineUnique course
sections
offered*
Unique course
sections
recorded
Videos
recorded/
videos
attempted (%)
Chem I and II201854/54 (100%)
Phy-A and Phy-C
I and II
312774/81 (91%)
Bio I181130/33 (91%)
Bio II12926/27 (96%)
Total8165184/195 (94%)

*When the same instructor(s) taught multiple sections of the same course during the same term, we assumed that the sections were taught similarly and recorded only one unique section.