Seeing an occupational health psychologist reduces sickness absence due to mental disorders: A quasi-experimental study

Mental health problems are a major public health and work-life issue. We examined in a quasi-experimental design whether occupational health psychologist (OHP) appointment reduces subsequent sickness absence (SA) due to mental disorders among younger Finnish employees. The present study was conducted among 18–39-year-old employees of the City of Helsinki using register data from the City of Helsinki and the Social lnsurance Institution of Finland. We examined differences in SA days due to mental disorders (ICD-10, F-diagnosed sickness allowances) between those treated (at least one OHP appointment for work ability support) and the comparison group (no OHP appointment) during a one-year follow-up. The full sample (n = 2286, 84% women) consisted of employees with SA due to a diagnosed mental disorder during 2008–2017. To account for the systematic differences between the treatment and comparison groups, the included participants were matched according to age, sex, occupational class, education, previous SA, occupational health primary care visits and psychotropic medication. The weighted matched sample included 1351 participants. In the weighted matched sample, the mean of SA days due to mental disorders was 11.4 (95% CI, 6.4–16.5) for those treated (n = 238) and 20.2 (95% CI, 17.0–23.4) for the comparison group (p