According to a study by Perry-Jenkins on working-class, dual-income couples, about what percent of these families include an adult who works during "off-shift" hours (not in the 8-to-5 traditional shift) ?

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According to the study by Perry-Jenkins, about 33% of working-class, dual-income couples include an adult who works during "off-shift" hours.

According to a Study by Perry-Jenkins on Working-Class, Dual-Income Couples