[BMJ Publishing Group Ltd and European League Against Rheumatism Annual European Congress of Rheumatology, EULAR 2019, Madrid, 12–15 June 2019 - ()] Poster Presentations - THU0379 DEPRESSIVE SYMPTOMS AND FUNCTIONAL IMPAIRMENT ARE FREQUENT AND AFFECT QUALITY OF LIFE IN ANKYLOSING SPONDYLITIS AND PSORIATIC ARTHRITIS: A QUESTIONNAIRE-BASED ASSESSMENT OF 300 PATIENTS COMPARED WITH 150 PATIENTS WITH PSORIASIS AND 150 PATIENTS WITH MECHANICAL BACK PAIN