This study examined whether ruminative style moderated the effects of expressive writing.

Sloan DM, Marx BP, Epstein EM, Dobbs JL. Expressive writing buffers against maladaptive rumination. Emotion. 2008 Apr;8(2):302-6. doi: 10.1037/1528-3542.8.2.302. PMID: 18410204.