This report contains 23 tables reporting the differences between men and women in lifetime labor force attachment, occupation, and earnings. The information was collected from a sample of approximately 20,000 households in May, June, July, and August 1984, as part of the Survey of Income Program Participation. The first part of this report presents a description of the differences between male and female workers in the frequency of work interruptions, the duration of lifetime work experience, the amount of time spent on current jobs, and occupational patterns; the second part presents an earnings model that shows the relationship between variations in earnings and variations in a set of independent variables that are thought to be related to earnings. Some highlights of the findings are the following: (1) females were much more likely than males to have had periods of time during their adult life when they did not work at a job or business; (2) females tended to have less time on their current job than males; (3) the mean earnings-per-hour figure for male wage and salary workers was $10.53 and the figure for females was $7.13, a female-to-male earnings ratio of .68; (4) the female-to-male earnings ratio was not much higher for workers with no work interruptions than for all workers; (5) 57 percent of male college graduates had majored in law, medicine, dentistry, science, mathematics, business, economics, and engineering, whereas only 28 percent of females had majored in one of these fields; (6) males and females work in occupations that are to some degree segregated by sex; and (7) working in an occupation that has a high proportion of women has a negative effect on earnings. (KC)