Historically, the definition of role functioning has focused narrowly on job-related limitations, although many measures also included limitations in the performance of housework or schoolwork. For the MOS, role functioning was defined more broadly to include roles related to volunteer work, caring for children, being a spouse or partner, and being involved in community activities. In the MOS, the authors sought to improve the validity of role functioning measures by separately defining and assessing role limitations due to physical and emotional problems.
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