. Author manuscript; available in PMC: 2019 Jun 12.

Published in final edited form as: Stat Methods Med Res. 2018 May 2;28(6):1676–1688. doi: 10.1177/0962280218772592

Table 1.

Data analysis: description of the 7050 stage IV breast cancer patients.

Variable	Mean/Frequency	Standard Deviation/ Percentage
Age	60.91	14.41
Race
White	5585	79.22
Black	721	10.23
Others	744	10.55
HER2
Negative	4180	59.29
Positive	1577	23.37
Missing	1293	18.34
Surgery
No	3916	55.55
Yes	3134	44.45
Radiation
No	4484	63.60
Yes	2566	36.40