Far a sample of white women aged 45-64, women who were out of the labor force had poorer self-reported health and higher mortality than women who were in the labor force. It has been hypothesized that women who are out of the labor force may tend to exaggerate their poor health in self-report data. However, no evidence of bias of this type was found in an analysis of the relationships between self-reported health and subsequent mortality. The validity of self-reports of illness as a reason for not seeking work has been assessed using data for a sample of 30-44 year old women who were out of the labor force. Over 90% of the women who gave illness or disability as their main reason for not seeking work had previous or contemporaneous independent, self-report evidence of poor health. The findings of this study and previous evidence indicate that poor health reduces the likelihood that a woman will join the labor force, and this is a major reason why women who are not in the labor force have poorer health than those who are in the labor force.