I’ll be presenting new data from a pre-registered replication at some conferences in the next few months. The study replicated findings that those with a Ph.D. in philosophy are more reflective, that less reflective philosophers tended towards certain philosophical views, and that some of these reflection-philosophy correlations are partly confoudned with culture, education, gender, or personality.
March 2022 update: these data are in a paper that was accepted by Review of Philosophy & Psychology.