"A variety of white-collar occupations, such as police detective and designer, are just as susceptible to declines in the abilities required for work as are blue-collar occupations. The Susceptibility Index is a significant predictor of early retirement; for example, workers in occupations in the 90th percentile of the Index are 5.7 percentage points more likely to retire by age 65 than workers in the 10th percentile. When controlling for the Susceptibility Index, the commonly used categorization of blue- or white-collar has no additional explanatory power in a model of early retirement."