Supplementary Table 4 from Predicting Health-Related Quality of Life Trajectories in Elderly Patients with Breast Cancer: From Prediagnosis to Long-term Follow-up

Supplementary Table S4 compares demographic, socioeconomic, clinical, and health-related baseline characteristics between two groups of elderly breast cancer patients from the SEER-MHOS dataset: those who completed both pre- and post-diagnosis HRQOL surveys (n=1,546) and those who completed only a pre-diagnosis survey (n=1,416). Differences are presented as proportions or mean differences with corresponding 95% confidence intervals. The table highlights potential selection biases in survey completion and the representativeness of the longitudinal cohort