Table 1 Summary of missing data for incident female stages 1–3 invasive breast cancer reported to the California Cancer Registry 2000–2010 with complete data for age, SES, year of diagnosis, survival time, and race/ethnicity (N = 179,143)
Missing | n(%) |
|---|---|
ER | 16,247 (9.0%) |
PR | 21,306 (11.8%) |
HER2* | 45,021 (24.9%) |
Tumor grade | 10,594 (5.9%) |
Unknown cause of death | 2,386 (1.5%) |
Total cases with one or more of the above variables missing † | 57,695 (31.9%) |
Total cases with complete data | 123,395 (68.1%) |