A study by Jeffrey Froh and his colleagues involved over 200 children aged around 12 years old. Every day for 2 weeks, one group of children was asked to make a list of 5 things they were grateful for; a second group was asked to make a list of 5 hassles; and a third group wasn’t asked to make any lists. The study had a positive benefit for the ‘gratitude’ group - most importantly, this group reported greater satisfaction with school than the other two groups. The researchers suggest that perhaps, to keep the activity fresh, the gratitude list could be written just once a week.
Froh, J. J., Sefick, W. J. & Emmons, R. A. (2008). Counting blessings in early adolescents: An experimental study of gratitude and subjective well-being. Journal of School Psychology, 46: 213-233.