evidence: The interaction between group and time on the K10 was significant, F (2, 677.2) = 3.94, p = .020, but differences between groups in change from pre-intervention to post-intervention were not significant, t (663.9) = 0.84, p = .399
intervention: E-mail based Self-Help for Depression 
comparator: Control
outcome: Patient Health Questionnaire depression scale improvement