Table 1. Summary statistics of trial-underrepresented group samples from the Scottish Cancer Registry, 2001–2015.

Characteristic	≥70 years	High comorbidity
Total number of patients	9,653	7,965
Total time at risk (years)	56,864	57,094
Median follow-up (years)	5.17	6.53
Number of breast cancer deaths	1,935	740
Number of other deaths	2,018	648
Five-year survival rate	74.7%	87.2%
Median age at diagnosis, years	76	60
Age	76.65 (0.05)	58.75 (0.14)
Tumour size (mm)	24.68 (0.16)	19.79 (0.21)
Inpatient days (in the 5 years prior)	4.99 (0.15)	13.39 (0.45)
PREDICT benefit score	3.02 (0.02)	2.68 (0.04)
Outpatient visits (in the 5 years prior)	7.22 (0.10)	12.68 (0.25)

Data given as mean (SD) unless otherwise indicated. Additional summary statistics available in S1 Table.