823968.fig.001a
(a)
823968.fig.001b
(b)
Figure 1: Age and sex distribution of patients with squamous cell carcinoma: relapse-free type (a) and relapse type (b). Open square: male; gray square: female. A total of 236 patients were analyzed in this study. There were 133 male (56.4%) and 103 female (43.6%) patients with an overall male-to-female ratio of 1.3 : 1. Their ages ranged from 21 to 92 years, and the average was 67.2 years (male 64.2, female 69.8, resp.). There were 191 relapse-free and 45 relapse patients. Among the 191 patients who were relapse-free, there were 115 males (60.2%) and 76 females (39.8%), with a male-to-female ratio of 1.5 : 1. In contrast, in the 45 cases with relapse, sex differences were reversed with 18 males (40.0%) and 27 females (60.0%). The mean age of the relapse-free group was 64.2 years (range from 21 to 92 years; male 63.0, female 65.9), while that of the relapse group was 67.2 years (range from 27 to 91 years; male 64.2, female 69.2). In the relapse patients, their sex difference was reversed as compared with the relapse-free group, and the difference was statistically significant ( ).