0 1 2 3 4 No adverse impact on occupational functioning Slight/mild impact on occupational functioning, some impairment Moderate impact on occupational functioning, significant impairment, intermittant employment Severe impact on occupational functioning, chronically unemployed Extreme impact on occupational functioning, not employed since event (20) 0 1 2 3 4 Asymptomatic Very much improvement Moderate improvement Slight improvement No improvement or insufficient information (21) 0 1 2 3 4 Global Improvement Global Severity Asymptomatic Slight/mild symptoms, little functional impairment Moderate symptoms, but functions satisfactorily with effort Severe symptoms, limited functioning even with effort Extreme symptoms, pervasive impairment