* Early Years: In the early 20th century, the magazine had a larger format than its current size.
* 1937: The magazine shifted to its now familiar condensed format, known as "Digest size." This was a significant change that was credited to the magazine's success and popularity.
* 2006: There was a slight change to the width of the magazine, making it slightly wider, but the overall format remained the same.
Therefore, while the "Digest size" has remained largely consistent since 1937, there have been some minor adjustments to the magazine's dimensions over time.