PURPOSE: The present study examines the role of Type D personality, anxiety and depression in quality of life (QoL) in patients with two chronic neurological diseases--Parkinson's disease (PD) and multiple sclerosis (MS). METHODS: This cross-sectional study included 142 PD patients (73 % males; mean age 67.6 ± 9.2 years) and 198 patients with MS (32.3 % males; 38.4 ± 10.8 years). Multiple regression analyses were used to analyze the association of UDPRS (PD patients) or EDSS (MS patients), Type D personality (DS-14) and anxiety and depression (HADS) with the physical (PCS) and mental summary (MCS) of QoL, as measured by the SF-36. RESULTS: In PD patients, Type D was significantly associated with MCS only; in MS patients, Type D was significantly associated with both dimensions--MCS and PCS. After adding anxiety and depression, the importance of Type D for the QoL model dramatically decreased. Anxiety and depression were strongly associated with lower scores in MCS and PCS in both PD and MS patients. CONCLUSIONS: The actual mood of PD and MS patients--the level of anxiety or depression--might have a greater impact on patients' QoL than their personality. Further longitudinal research should focus on how the pathway consisting of personality traits, anxiety and depression, and QoL might be constructed.
PURPOSE: The present study examines the role of Type D personality, anxiety and depression in quality of life (QoL) in patients with two chronic neurological diseases--Parkinson's disease (PD) and multiple sclerosis (MS). METHODS: This cross-sectional study included 142 PDpatients (73 % males; mean age 67.6 ± 9.2 years) and 198 patients with MS (32.3 % males; 38.4 ± 10.8 years). Multiple regression analyses were used to analyze the association of UDPRS (PDpatients) or EDSS (MSpatients), Type D personality (DS-14) and anxiety and depression (HADS) with the physical (PCS) and mental summary (MCS) of QoL, as measured by the SF-36. RESULTS: In PDpatients, Type D was significantly associated with MCS only; in MSpatients, Type D was significantly associated with both dimensions--MCS and PCS. After adding anxiety and depression, the importance of Type D for the QoL model dramatically decreased. Anxiety and depression were strongly associated with lower scores in MCS and PCS in both PD and MSpatients. CONCLUSIONS: The actual mood of PD and MSpatients--the level of anxiety or depression--might have a greater impact on patients' QoL than their personality. Further longitudinal research should focus on how the pathway consisting of personality traits, anxiety and depression, and QoL might be constructed.
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