The changing U.S. labor force and occupational differentiation by sex.

The degree of occupational differentiation by sex in the U.S. labor force is examined utilizing various measures and occupational classifications over the period 1900-1970. A consideration of comparable occupations over time indicates that while occupational differentiation by sex is still substantial, an irregular, measurable decline in that differentiation has occurred during this century. Existing labor force structure seems relatively unimportant in explaining this ongoing change. Apparently more significant are social and historical factors as they have influenced specific occupations in certain decades.