A total of 750 CC patients and 1498 CC nonpatients who had been diagnosed as cervical dysplasia were extracted from the NHIRD, with the mean age of 56.2 ± 13.2 years (Table 1). There were no differences in age and urbanization of residence between CC patients and nonpatients. On the other hand, the proportion of white collar workers among CC patients was less than that among CC nonpatients (28.0% versus 37.5%), but the proportions of blue collar workers (41.9% versus 37.4%) and homemakers (30.1% versus 25.1%) among CC patients were higher than CC nonpatients.