Randomised controlled trial to evaluate the effectiveness of collaborative
care in a Dutch occupational healthcare setting: 126 workers on sick leave
with major depressive disorder were randomised to usual care
(n = 61) or collaborative care (n =
65). After 3 months, collaborative care was more effective on the primary
outcome measure of treatment response (i.e. reduction in symptoms of ≥50%)
on the Patient Health Questionnaire-9 (PHQ-9). However, the groups did not
differ on the PHQ-9 as a continuous outcome measure. Implications of these
results are discussed.