Screen readers read column and row headers to provide the listener with information on the tables' content and structure.
Solutions
Use tables for data that fits well into rows and columns.
Do not use tables for formatting pages, links, or other information.
Always use table headers to describe the contents of the table columns.
The table headers should clearly communicate the data below them.
Avoid spanned rows as screen readers may not properly parse them.
Example
Here is an example default 3x2 table with a header created within LibGuide's rich text editor. It's key you identify which row or column is the table header.
State
State Capital
Ohio
Columbus
Indiana
Indianapolis
Kentucky
Frankfort
Identify which row or column acts as the headers with the table properties tool