Dear all,

This question might sound stupid but I can't find the way to calculate 95%CI for percent change between frequencies (but not between proportion).

For example:
9630 events in year X
6754 events in year Y
percent change = (9630-6754)/9630= -30%

How can I calculate the 95%CI of the percent change without having the denominator for these events?

Many thanks for your help!

Kind regards,

Manon