Prevalence of major depression in ALS: Comparison of a semi-structured interview and four self-report measures

This study aimed to compare prevalence estimates of current major depression obtained with a semi-structured interview and four frequently used self-report depression severity measures in a sample of amyotrophic lateral sclerosis (ALS) patients. Thirty-seven ALS patients (56.8% males) aged 37-80 years (mean 62.0 +/- 10.7) without respiratory insufficiency or dementia were studied during hospitalization or on a follow-up visit. SCID-IV interview as well as self-report Hospital Anxiety and Depression Scale (HADS), ALS Depression Inventory (ADI), Center for Epidemiological Studies-Depression scale (CES-D) and Beck Depression Inventory (BDI-I) were administered. Kappa coefficients of diagnostic agreement between various instruments were calculated. Results showed that 37.8% of patients had a lifetime diagnosis of depression and in 13.5% depression followed ALS onset. Percentages of patients 'diagnosed' with current major depression were: 21.6% (SCID-IV), 16.7% (HADS-D >= 11), 16.2% (ADI >= 29), 25% (CES-D >= 24) and 24.3% (BDI-I >= 16). High kappa values were recorded between CES-D, BDI-I and SCID-IV as well as between HADS-D and ADI. CES-D, BDI-I and SCID-IV gave the highest prevalence estimates of current major depression in ALS patients and were in poor agreement with estimates based on HADS and ADI; it is suggested that this is possibly because the former give a far greater emphasis on physical symptoms of depression than the latter.