Association of socioeconomic status with other potential prognostic variables among persons diagnosed with hepatocellular carcinoma, 1990–2009.

Income quintile 1, lowest socioeconomic status; Income quintile 5, highest socioeconomic status.
“-“, counts less than five have been suppressed. *p-values were calculated using chi-squared tests, testing for homogeneity across all income groups, excluding the missing groups. †Patients were not considered as being screened if they had only one ultrasound in the three months prior to diagnosis or if they were receiving HCC care prior to the ultrasound. ‡Included multiple treatments for some people. HCC, hepatocellular carcinoma.

收入五分位组1代表最低社会经济地位；收入五分位组5代表最高社会经济地位。
“-”表示样本计数小于5的结果已被隐匿处理。
* 显著性p值通过卡方检验计算得出，用于检验除缺失组外的所有收入组间的同质性。
† 若患者仅在确诊前3个月内接受过1次超声检查，或在超声检查前已接受肝细胞肝癌（hepatocellular carcinoma，HCC）相关诊疗，则不被纳入筛查人群。
‡ 部分患者被纳入了多次治疗的统计数据。
HCC即肝细胞肝癌（hepatocellular carcinoma）。