We are pleased to announce the release of the refreshed cumulated trend dataset compiled from the ISSP Religion I-IV modules. This updated dataset incorporates data from 1991, 1998, 2008, and the latest ISSP 2018 wave. Encompassing 38 countries worldwide, the dataset enables combined cross-national and trend analyses spanning three decades.

For more information see the ISSP Religion cumulation web page:

https://www.gesis.org/en/issp/data-and-documentation/religion/cumulation