Landmark Analysis Exploring the Optimal Period for Intensive Monitoring after Return to work for Employees with Sickness Absence due to Common Mental Disorders.

OBJECTIVE This study aimed to clarify when and how long intensive monitoring should be performed after return to work (RTW) of employees experiencing common mental disorders using landmark analysis. METHODS We conducted a retrospective survey of workers who experienced sickness absences (SAs) during 36 months after RTW. Sustainability rates of attendance among the following groups were compared before and after the landmark (18 months): one SA episode (Group 1), two SA episodes (Group 2), and three or more SA episodes (Group 3). RESULTS Before the landmark, sustainability in Group 1 was higher than in the other groups, with no significant differences among groups after the landmark. Sustainability rate of attendance tended to be lower before than after the landmark in each group. CONCLUSIONS Intensive monitoring is suggested in the first 18 months after RTW.