Academic lectures often contain facts and statistical data that can be included in descriptions of patterns, as well as of trends and static numbers.
A pattern is series of repeated events or actions that describe things how things really are. A trend is a change or development, and a static number describes a single event.
Presenters often use terms to make the statistical data approximate. This happens when the exact numbers are unknown or unclear, and also to simplify figures for the audience.
approximately just under just over almost more than about