Impact of language proficiency on mental health service use, treatment and outcomes: "Lost in Translation".

Background: Mastery of a language is bound to place of origin; low language proficiency is thus related to migration and cultural differences, all of which influence access to mental health care, treatment and outcomes. Switzerland, being multilingual, allows the disentangling of language proficiency from migration and, to some extent, culture. This study uses propensity score matching to explore how language proficiency relates to help-seeking behaviour, service use, treatment and outcomes in patients with mental health disorders.

Methods: We used the first admission of patients admitted to and discharged from an academic psychiatric hospital in Switzerland between January 1st, 2013 and December 31st, 2019, with an observation period of one-year post-discharge (until December 31st, 2020). We paired 2101 patients with low language proficiency to 2101 language proficient patients, balancing baseline sociodemographic and clinical characteristics using propensity score matching.

Results: Patients with low language proficiency had a higher probability of compulsory admission (OR: 1.79, 99%CI: 1.60-2.02); which remained after adjustment for confounders (OR: 1.51; 99%CI: 1.21-1.89). Whilst in treatment, they had higher rates of compulsory medication (OR: 1.73, 99%CI: 1.16-2.59) and seclusion/restraint (OR: 1.87, 99%CI: 1.25-2.79). Furthermore, patients initially admitted voluntarily had a higher probability of being compulsorily retained (OR: 1.74, 99%CI: 1.24-2.46). Both groups showed similar clinical improvement rates and service use parameters.

Conclusions: Our results demonstrate that low language proficiency constitutes a risk factor for coercive measures throughout hospitalisation. The results demonstrate the need for an increase in language sensitivity in psychiatric care.